<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with WebFilings-->
<!-- -->
<linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <roleRef roleURI="http://www.bnsf.com/role/AccountingPoliciesAndInterimResults" xlink:href="bni-20140331.xsd#AccountingPoliciesAndInterimResults" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/AccountingPoliciesAndInterimResultsDetails" xlink:href="bni-20140331.xsd#AccountingPoliciesAndInterimResultsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/AccountingPronouncements" xlink:href="bni-20140331.xsd#AccountingPronouncements" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/AccountsReceivableNet" xlink:href="bni-20140331.xsd#AccountsReceivableNet" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/AccountsReceivableNetDetails" xlink:href="bni-20140331.xsd#AccountsReceivableNetDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/AccumulatedOtherComprehensiveIncomeByComponentDetails" xlink:href="bni-20140331.xsd#AccumulatedOtherComprehensiveIncomeByComponentDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/CommitmentsAndContingencies" xlink:href="bni-20140331.xsd#CommitmentsAndContingencies" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/CommitmentsAndContingenciesEnvironmentalDetails" xlink:href="bni-20140331.xsd#CommitmentsAndContingenciesEnvironmentalDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/CommitmentsAndContingenciesInsuranceDetails" xlink:href="bni-20140331.xsd#CommitmentsAndContingenciesInsuranceDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/CommitmentsAndContingenciesPersonalInjuryDetails" xlink:href="bni-20140331.xsd#CommitmentsAndContingenciesPersonalInjuryDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/CommitmentsAndContingenciesTables" xlink:href="bni-20140331.xsd#CommitmentsAndContingenciesTables" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/ComprehensiveIncome" xlink:href="bni-20140331.xsd#ComprehensiveIncome" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/ComprehensiveIncomeTables" xlink:href="bni-20140331.xsd#ComprehensiveIncomeTables" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/ConsolidatedBalanceSheets" xlink:href="bni-20140331.xsd#ConsolidatedBalanceSheets" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical" xlink:href="bni-20140331.xsd#ConsolidatedBalanceSheetsUnauditedParenthetical" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/ConsolidatedStatementsOfCashFlows" xlink:href="bni-20140331.xsd#ConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity" xlink:href="bni-20140331.xsd#ConsolidatedStatementsOfChangesInStockholdersEquity" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/ConsolidatedStatementsOfComprehensiveIncome" xlink:href="bni-20140331.xsd#ConsolidatedStatementsOfComprehensiveIncome" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/ConsolidatedStatementsOfComprehensiveIncomeUnauditedParentheticals" xlink:href="bni-20140331.xsd#ConsolidatedStatementsOfComprehensiveIncomeUnauditedParentheticals" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/ConsolidatedStatementsOfIncome" xlink:href="bni-20140331.xsd#ConsolidatedStatementsOfIncome" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/Debt" xlink:href="bni-20140331.xsd#Debt" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/DebtFairValueOfDebtInstrumentsDetails" xlink:href="bni-20140331.xsd#DebtFairValueOfDebtInstrumentsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/DebtGuaranteesDetails" xlink:href="bni-20140331.xsd#DebtGuaranteesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/DebtTables" xlink:href="bni-20140331.xsd#DebtTables" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/DebtVariableInterestEntitiesLeasesDetails" xlink:href="bni-20140331.xsd#DebtVariableInterestEntitiesLeasesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/DocumentAndEntityInformation" xlink:href="bni-20140331.xsd#DocumentAndEntityInformation" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/EmploymentBenefitPlans" xlink:href="bni-20140331.xsd#EmploymentBenefitPlans" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/EmploymentBenefitPlansDetails" xlink:href="bni-20140331.xsd#EmploymentBenefitPlansDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/EmploymentBenefitPlansTables" xlink:href="bni-20140331.xsd#EmploymentBenefitPlansTables" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/OtherAssets" xlink:href="bni-20140331.xsd#OtherAssets" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/OtherAssetsDetails" xlink:href="bni-20140331.xsd#OtherAssetsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/OtherAssetsTables" xlink:href="bni-20140331.xsd#OtherAssetsTables" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/OtherIntangibleAssetsAndLiabilities" xlink:href="bni-20140331.xsd#OtherIntangibleAssetsAndLiabilities" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/OtherIntangibleAssetsAndLiabilitiesDetails" xlink:href="bni-20140331.xsd#OtherIntangibleAssetsAndLiabilitiesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/OtherIntangibleAssetsAndLiabilitiesTables" xlink:href="bni-20140331.xsd#OtherIntangibleAssetsAndLiabilitiesTables" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/ReclassificationsOutOfAccumulatedOtherComprehensiveIncomeDetails" xlink:href="bni-20140331.xsd#ReclassificationsOutOfAccumulatedOtherComprehensiveIncomeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/RelatedPartyTransactions" xlink:href="bni-20140331.xsd#RelatedPartyTransactions" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/RelatedPartyTransactionsDetails" xlink:href="bni-20140331.xsd#RelatedPartyTransactionsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.bnsf.com/role/RelatedPartyTransactionsTables" xlink:href="bni-20140331.xsd#RelatedPartyTransactionsTables" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" xlink:type="simple" />
  <definitionLink xlink:role="http://www.bnsf.com/role/AccountingPoliciesAndInterimResults" xlink:type="extended" />
  <definitionLink xlink:role="http://www.bnsf.com/role/AccountingPoliciesAndInterimResultsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_4A6073A8DD8D59847E82B32A6DAAC916" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3214E2542A6E2762DFC8B32A6DAA3EE6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4A6073A8DD8D59847E82B32A6DAAC916" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3214E2542A6E2762DFC8B32A6DAA3EE6" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_E2FF6B196F17E475A651B32A6DAA7857" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3214E2542A6E2762DFC8B32A6DAA3EE6" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_E2FF6B196F17E475A651B32A6DAA7857" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_E56A0705568A9A3C0A23B32A6DAA0704_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_E2FF6B196F17E475A651B32A6DAA7857" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_E56A0705568A9A3C0A23B32A6DAA0704_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_E56A0705568A9A3C0A23B32A6DAA0704" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_E2FF6B196F17E475A651B32A6DAA7857" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_E56A0705568A9A3C0A23B32A6DAA0704" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_NorthernSanteFeCorporationMember" xlink:label="loc_bni_NorthernSanteFeCorporationMember_BB483E3F040DB765FF08B32A6DAA530D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_E56A0705568A9A3C0A23B32A6DAA0704" xlink:to="loc_bni_NorthernSanteFeCorporationMember_BB483E3F040DB765FF08B32A6DAA530D" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_BusinessCombinationStepAcquisitionRemainingEquityInterestAcquiredPercentage" xlink:label="loc_bni_BusinessCombinationStepAcquisitionRemainingEquityInterestAcquiredPercentage_621E7858F048330832A8B32A6DAAA73E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4A6073A8DD8D59847E82B32A6DAAC916" xlink:to="loc_bni_BusinessCombinationStepAcquisitionRemainingEquityInterestAcquiredPercentage_621E7858F048330832A8B32A6DAAA73E" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.bnsf.com/role/AccountingPronouncements" xlink:type="extended" />
  <definitionLink xlink:role="http://www.bnsf.com/role/AccountsReceivableNet" xlink:type="extended" />
  <definitionLink xlink:role="http://www.bnsf.com/role/AccountsReceivableNetDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.bnsf.com/role/AccumulatedOtherComprehensiveIncomeByComponentDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_334724057684C2C81569B49EDFBAC12E" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_6A38A7709BD3807F0021B49EDFBA98A8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_334724057684C2C81569B49EDFBAC12E" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_6A38A7709BD3807F0021B49EDFBA98A8" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_23B128C9002E3C7A7580B49EDFBA5BD0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_6A38A7709BD3807F0021B49EDFBA98A8" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_23B128C9002E3C7A7580B49EDFBA5BD0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_4F8980A539C84E48DE5BB49EDFBAE6BD_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_23B128C9002E3C7A7580B49EDFBA5BD0" xlink:to="loc_us-gaap_EquityComponentDomain_4F8980A539C84E48DE5BB49EDFBAE6BD_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_4F8980A539C84E48DE5BB49EDFBAE6BD" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_23B128C9002E3C7A7580B49EDFBA5BD0" xlink:to="loc_us-gaap_EquityComponentDomain_4F8980A539C84E48DE5BB49EDFBAE6BD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_E40B9FE93952F60F660FB49EDFBA7723" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_4F8980A539C84E48DE5BB49EDFBAE6BD" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_E40B9FE93952F60F660FB49EDFBA7723" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentsMember" xlink:label="loc_us-gaap_EquityMethodInvestmentsMember_3D2C4541F7B32DFCF798B49EDFBAC170" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_4F8980A539C84E48DE5BB49EDFBAE6BD" xlink:to="loc_us-gaap_EquityMethodInvestmentsMember_3D2C4541F7B32DFCF798B49EDFBAC170" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_AccumulatedOtherComprehensiveIncomeLossNetofTaxRollForward" xlink:label="loc_bni_AccumulatedOtherComprehensiveIncomeLossNetofTaxRollForward_2D3EB1AFAD2FF3A73D42B49EDFBA6F3F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_334724057684C2C81569B49EDFBAC12E" xlink:to="loc_bni_AccumulatedOtherComprehensiveIncomeLossNetofTaxRollForward_2D3EB1AFAD2FF3A73D42B49EDFBA6F3F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_22D325EDBE954EDE7E1EB49EDFBA2CE8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bni_AccumulatedOtherComprehensiveIncomeLossNetofTaxRollForward_2D3EB1AFAD2FF3A73D42B49EDFBA6F3F" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_22D325EDBE954EDE7E1EB49EDFBA2CE8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_AD02E24D52934C95E64AB49EDFBAE862" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bni_AccumulatedOtherComprehensiveIncomeLossNetofTaxRollForward_2D3EB1AFAD2FF3A73D42B49EDFBA6F3F" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_AD02E24D52934C95E64AB49EDFBAE862" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_460E56525E3FD421F0F9B49EDFBAB399" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bni_AccumulatedOtherComprehensiveIncomeLossNetofTaxRollForward_2D3EB1AFAD2FF3A73D42B49EDFBA6F3F" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_460E56525E3FD421F0F9B49EDFBAB399" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.bnsf.com/role/CommitmentsAndContingencies" xlink:type="extended" />
  <definitionLink xlink:role="http://www.bnsf.com/role/CommitmentsAndContingenciesEnvironmentalDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingenciesLineItems" xlink:label="loc_us-gaap_LossContingenciesLineItems_E23EBFA7280D22179291B4A06FF7527D" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingenciesTable" xlink:label="loc_us-gaap_LossContingenciesTable_2C4A883FD499AED01810B4A06FF7C237" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_E23EBFA7280D22179291B4A06FF7527D" xlink:to="loc_us-gaap_LossContingenciesTable_2C4A883FD499AED01810B4A06FF7C237" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_21D5552A748703F4CAE8B4A06FF76AD2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_2C4A883FD499AED01810B4A06FF7C237" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_21D5552A748703F4CAE8B4A06FF76AD2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingencyNatureDomain" xlink:label="loc_us-gaap_LossContingencyNatureDomain_03A37DEE7B23FCBB60B9B4A06FF7C39D_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_21D5552A748703F4CAE8B4A06FF76AD2" xlink:to="loc_us-gaap_LossContingencyNatureDomain_03A37DEE7B23FCBB60B9B4A06FF7C39D_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingencyNatureDomain" xlink:label="loc_us-gaap_LossContingencyNatureDomain_03A37DEE7B23FCBB60B9B4A06FF7C39D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_21D5552A748703F4CAE8B4A06FF76AD2" xlink:to="loc_us-gaap_LossContingencyNatureDomain_03A37DEE7B23FCBB60B9B4A06FF7C39D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EnvironmentalIssueMember" xlink:label="loc_us-gaap_EnvironmentalIssueMember_443F775ED23AE36D15BAB4A06FF7E3B4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_03A37DEE7B23FCBB60B9B4A06FF7C39D" xlink:to="loc_us-gaap_EnvironmentalIssueMember_443F775ED23AE36D15BAB4A06FF7E3B4" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_SiteContingencyEstimatedTimeFrameForAccruedCostDistributions" xlink:label="loc_bni_SiteContingencyEstimatedTimeFrameForAccruedCostDistributions_F01664D3C679F456220FB4A06FF75CC0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_E23EBFA7280D22179291B4A06FF7527D" xlink:to="loc_bni_SiteContingencyEstimatedTimeFrameForAccruedCostDistributions_F01664D3C679F456220FB4A06FF75CC0" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_AdministrativeJudicialAndOtherMandatoryCleanupEffortsTotalSites" xlink:label="loc_bni_AdministrativeJudicialAndOtherMandatoryCleanupEffortsTotalSites_A8988AB843F7D3F049CFB4A06FF74DA5" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_E23EBFA7280D22179291B4A06FF7527D" xlink:to="loc_bni_AdministrativeJudicialAndOtherMandatoryCleanupEffortsTotalSites_A8988AB843F7D3F049CFB4A06FF74DA5" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_AdministrativeJudicialAndOtherMandatoryCleanupEffortsSuperfundSites" xlink:label="loc_bni_AdministrativeJudicialAndOtherMandatoryCleanupEffortsSuperfundSites_9B5000134DE843439F05B4A06FF78C2A" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_E23EBFA7280D22179291B4A06FF7527D" xlink:to="loc_bni_AdministrativeJudicialAndOtherMandatoryCleanupEffortsSuperfundSites_9B5000134DE843439F05B4A06FF78C2A" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_RecordedLiabilityForThirdPartyEnvironmentalTortClaims" xlink:label="loc_bni_RecordedLiabilityForThirdPartyEnvironmentalTortClaims_FE0F7C023C5B84798A51B4A06FF75BE1" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_E23EBFA7280D22179291B4A06FF7527D" xlink:to="loc_bni_RecordedLiabilityForThirdPartyEnvironmentalTortClaims_FE0F7C023C5B84798A51B4A06FF75BE1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccruedEnvironmentalLossContingenciesCurrent" xlink:label="loc_us-gaap_AccruedEnvironmentalLossContingenciesCurrent_B8977D5523BCB174A861B4A06FF7262D" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_E23EBFA7280D22179291B4A06FF7527D" xlink:to="loc_us-gaap_AccruedEnvironmentalLossContingenciesCurrent_B8977D5523BCB174A861B4A06FF7262D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingencyRangeOfPossibleLossMinimum" xlink:label="loc_us-gaap_LossContingencyRangeOfPossibleLossMinimum_1C498A6800BEF2ECF51FB4A06FF757CD" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_E23EBFA7280D22179291B4A06FF7527D" xlink:to="loc_us-gaap_LossContingencyRangeOfPossibleLossMinimum_1C498A6800BEF2ECF51FB4A06FF757CD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingencyRangeOfPossibleLossMaximum" xlink:label="loc_us-gaap_LossContingencyRangeOfPossibleLossMaximum_6A7F2582C875C093ADBDB4A06FF79433" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_E23EBFA7280D22179291B4A06FF7527D" xlink:to="loc_us-gaap_LossContingencyRangeOfPossibleLossMaximum_6A7F2582C875C093ADBDB4A06FF79433" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccrualForEnvironmentalLossContingenciesRollForward" xlink:label="loc_us-gaap_AccrualForEnvironmentalLossContingenciesRollForward_AD09E5771527388346F0B4A06FF7A715" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_E23EBFA7280D22179291B4A06FF7527D" xlink:to="loc_us-gaap_AccrualForEnvironmentalLossContingenciesRollForward_AD09E5771527388346F0B4A06FF7A715" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccrualForEnvironmentalLossContingencies" xlink:label="loc_us-gaap_AccrualForEnvironmentalLossContingencies_6EC11E47F4EFE5D4ED89B4A06FF7C9D9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccrualForEnvironmentalLossContingenciesRollForward_AD09E5771527388346F0B4A06FF7A715" xlink:to="loc_us-gaap_AccrualForEnvironmentalLossContingencies_6EC11E47F4EFE5D4ED89B4A06FF7C9D9" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_AccrualForEnvironmentalLossContingenciesProvision" xlink:label="loc_bni_AccrualForEnvironmentalLossContingenciesProvision_B73DE47C7566BAB87547B4A06FF771F9" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccrualForEnvironmentalLossContingenciesRollForward_AD09E5771527388346F0B4A06FF7A715" xlink:to="loc_bni_AccrualForEnvironmentalLossContingenciesProvision_B73DE47C7566BAB87547B4A06FF771F9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccrualForEnvironmentalLossContingenciesPayments" xlink:label="loc_us-gaap_AccrualForEnvironmentalLossContingenciesPayments_D05B6FB645F49323D30CB4A06FF7E304" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccrualForEnvironmentalLossContingenciesRollForward_AD09E5771527388346F0B4A06FF7A715" xlink:to="loc_us-gaap_AccrualForEnvironmentalLossContingenciesPayments_D05B6FB645F49323D30CB4A06FF7E304" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.bnsf.com/role/CommitmentsAndContingenciesInsuranceDetails" xlink:type="extended">
    <loc xlink:href="bni-20140331.xsd#bni_InsuranceLineItems" xlink:label="loc_bni_InsuranceLineItems_201BD8CC515C8ADF2684B4A070357EB6" xlink:type="locator" />
    <loc xlink:href="bni-20140331.xsd#bni_InsuranceTable" xlink:label="loc_bni_InsuranceTable_43852490EED2474E7AE4B4A070359905" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_bni_InsuranceLineItems_201BD8CC515C8ADF2684B4A070357EB6" xlink:to="loc_bni_InsuranceTable_43852490EED2474E7AE4B4A070359905" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_A41C71A8C0986E156C11B4A07035E647" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_bni_InsuranceTable_43852490EED2474E7AE4B4A070359905" xlink:to="loc_dei_LegalEntityAxis_A41C71A8C0986E156C11B4A07035E647" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_F640DF9F40CD5BA675D7B4A070358954_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_A41C71A8C0986E156C11B4A07035E647" xlink:to="loc_dei_EntityDomain_F640DF9F40CD5BA675D7B4A070358954_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_F640DF9F40CD5BA675D7B4A070358954" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_A41C71A8C0986E156C11B4A07035E647" xlink:to="loc_dei_EntityDomain_F640DF9F40CD5BA675D7B4A070358954" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AffiliatedEntityMember" xlink:label="loc_us-gaap_AffiliatedEntityMember_80953327BE1634418CAFB4A07035E87C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_F640DF9F40CD5BA675D7B4A070358954" xlink:to="loc_us-gaap_AffiliatedEntityMember_80953327BE1634418CAFB4A07035E87C" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_BnsfInsuranceCompanyMember" xlink:label="loc_bni_BnsfInsuranceCompanyMember_EBBAFE8749AC8D72C269B4A070356906" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AffiliatedEntityMember_80953327BE1634418CAFB4A07035E87C" xlink:to="loc_bni_BnsfInsuranceCompanyMember_EBBAFE8749AC8D72C269B4A070356906" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_PremiumsWrittenByRelatedInsuranceEntityNetOfReimbursements" xlink:label="loc_bni_PremiumsWrittenByRelatedInsuranceEntityNetOfReimbursements_D893281F88F8EFBF4750B4A07035BDA5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bni_InsuranceLineItems_201BD8CC515C8ADF2684B4A070357EB6" xlink:to="loc_bni_PremiumsWrittenByRelatedInsuranceEntityNetOfReimbursements_D893281F88F8EFBF4750B4A07035BDA5" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_GeneralInsuranceExpenseRelatedInsuranceEntity" xlink:label="loc_bni_GeneralInsuranceExpenseRelatedInsuranceEntity_F5D824B093851E0CDFCEB4A070356360" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bni_InsuranceLineItems_201BD8CC515C8ADF2684B4A070357EB6" xlink:to="loc_bni_GeneralInsuranceExpenseRelatedInsuranceEntity_F5D824B093851E0CDFCEB4A070356360" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_PrepaidInsuranceWrittenByRelatedInsuranceEntity" xlink:label="loc_bni_PrepaidInsuranceWrittenByRelatedInsuranceEntity_F3BFB5F67E2C1A2BB363B4A07035D786" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bni_InsuranceLineItems_201BD8CC515C8ADF2684B4A070357EB6" xlink:to="loc_bni_PrepaidInsuranceWrittenByRelatedInsuranceEntity_F3BFB5F67E2C1A2BB363B4A07035D786" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_ClaimPaymentsMadeByRelatedInsuranceEntityToRelatedSubsidiary" xlink:label="loc_bni_ClaimPaymentsMadeByRelatedInsuranceEntityToRelatedSubsidiary_AD93C754A0C2ED30FCCCB4A070355343" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bni_InsuranceLineItems_201BD8CC515C8ADF2684B4A070357EB6" xlink:to="loc_bni_ClaimPaymentsMadeByRelatedInsuranceEntityToRelatedSubsidiary_AD93C754A0C2ED30FCCCB4A070355343" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_InsuranceSettlementsReceivableFromRelatedInsuranceEntity" xlink:label="loc_bni_InsuranceSettlementsReceivableFromRelatedInsuranceEntity_158DB36295A7B47711E4B4A07035B23A" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bni_InsuranceLineItems_201BD8CC515C8ADF2684B4A070357EB6" xlink:to="loc_bni_InsuranceSettlementsReceivableFromRelatedInsuranceEntity_158DB36295A7B47711E4B4A07035B23A" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.bnsf.com/role/CommitmentsAndContingenciesPersonalInjuryDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingenciesLineItems" xlink:label="loc_us-gaap_LossContingenciesLineItems_FF45E826548DEF4D9F62B4A070458718" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingenciesTable" xlink:label="loc_us-gaap_LossContingenciesTable_E12DA5C48DE23EF2655AB4A070455423" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_FF45E826548DEF4D9F62B4A070458718" xlink:to="loc_us-gaap_LossContingenciesTable_E12DA5C48DE23EF2655AB4A070455423" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_563414AE59CDFD09CA80B4A0704503A5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_E12DA5C48DE23EF2655AB4A070455423" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_563414AE59CDFD09CA80B4A0704503A5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_8F46B75D9A357B54BADEB4A0704566E8_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_563414AE59CDFD09CA80B4A0704503A5" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_8F46B75D9A357B54BADEB4A0704566E8_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_8F46B75D9A357B54BADEB4A0704566E8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_563414AE59CDFD09CA80B4A0704503A5" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_8F46B75D9A357B54BADEB4A0704566E8" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_CurrentLiabilitiesMember" xlink:label="loc_bni_CurrentLiabilitiesMember_6F4B0222BEAC4AFCEEAAB4A07045A82C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_8F46B75D9A357B54BADEB4A0704566E8" xlink:to="loc_bni_CurrentLiabilitiesMember_6F4B0222BEAC4AFCEEAAB4A07045A82C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_58CED469D82F4A08CFEBB4A0704541A1" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_E12DA5C48DE23EF2655AB4A070455423" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_58CED469D82F4A08CFEBB4A0704541A1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingencyNatureDomain" xlink:label="loc_us-gaap_LossContingencyNatureDomain_24725D6AA1A878423B7AB4A070454C3F_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_58CED469D82F4A08CFEBB4A0704541A1" xlink:to="loc_us-gaap_LossContingencyNatureDomain_24725D6AA1A878423B7AB4A070454C3F_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingencyNatureDomain" xlink:label="loc_us-gaap_LossContingencyNatureDomain_24725D6AA1A878423B7AB4A070454C3F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_58CED469D82F4A08CFEBB4A0704541A1" xlink:to="loc_us-gaap_LossContingencyNatureDomain_24725D6AA1A878423B7AB4A070454C3F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UnassertedClaimMember" xlink:label="loc_us-gaap_UnassertedClaimMember_3EBE4C98D39888AA3E58B4A070458704" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_24725D6AA1A878423B7AB4A070454C3F" xlink:to="loc_us-gaap_UnassertedClaimMember_3EBE4C98D39888AA3E58B4A070458704" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_PersonalInjuryMember" xlink:label="loc_bni_PersonalInjuryMember_E30F76C766A1F6EA9253B4A070457EB0" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_24725D6AA1A878423B7AB4A070454C3F" xlink:to="loc_bni_PersonalInjuryMember_E30F76C766A1F6EA9253B4A070457EB0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingencyEstimateAbstract" xlink:label="loc_us-gaap_LossContingencyEstimateAbstract_7B9C84822907E5368D8DB4A070450BF5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_FF45E826548DEF4D9F62B4A070458718" xlink:to="loc_us-gaap_LossContingencyEstimateAbstract_7B9C84822907E5368D8DB4A070450BF5" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_PercentOfFutureUnassertedAsbestosClaimsToBeFiledWithinNextTenYears" xlink:label="loc_bni_PercentOfFutureUnassertedAsbestosClaimsToBeFiledWithinNextTenYears_B878AACF7C4BCFC1BBF6B4A070452C1D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyEstimateAbstract_7B9C84822907E5368D8DB4A070450BF5" xlink:to="loc_bni_PercentOfFutureUnassertedAsbestosClaimsToBeFiledWithinNextTenYears_B878AACF7C4BCFC1BBF6B4A070452C1D" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_PercentOfFutureUnassertedAsbestosClaimsToBeFiledWithinNextFifteenYears" xlink:label="loc_bni_PercentOfFutureUnassertedAsbestosClaimsToBeFiledWithinNextFifteenYears_E187A1B1C77EEFB27F73B4A07045C5DE" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyEstimateAbstract_7B9C84822907E5368D8DB4A070450BF5" xlink:to="loc_bni_PercentOfFutureUnassertedAsbestosClaimsToBeFiledWithinNextFifteenYears_E187A1B1C77EEFB27F73B4A07045C5DE" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_PercentOfFutureUnassertedAsbestosClaimsToBeFiledWithinNextTwentyFiveYears" xlink:label="loc_bni_PercentOfFutureUnassertedAsbestosClaimsToBeFiledWithinNextTwentyFiveYears_0FD516A834E7B1FFACCDB4A070450106" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyEstimateAbstract_7B9C84822907E5368D8DB4A070450BF5" xlink:to="loc_bni_PercentOfFutureUnassertedAsbestosClaimsToBeFiledWithinNextTwentyFiveYears_0FD516A834E7B1FFACCDB4A070450106" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_LengthInYearsFor60PercentOfFutureUnassertedAsbestosClaimsToBeFiled" xlink:label="loc_bni_LengthInYearsFor60PercentOfFutureUnassertedAsbestosClaimsToBeFiled_E9BE52AE036262DCA3CBB4A070456F75" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyEstimateAbstract_7B9C84822907E5368D8DB4A070450BF5" xlink:to="loc_bni_LengthInYearsFor60PercentOfFutureUnassertedAsbestosClaimsToBeFiled_E9BE52AE036262DCA3CBB4A070456F75" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_LengthInYearsFor80PercentOfFutureUnassertedAsbestosClaimsToBeFiled" xlink:label="loc_bni_LengthInYearsFor80PercentOfFutureUnassertedAsbestosClaimsToBeFiled_242EAFB1D6B78CA14187B4A070451B4B" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyEstimateAbstract_7B9C84822907E5368D8DB4A070450BF5" xlink:to="loc_bni_LengthInYearsFor80PercentOfFutureUnassertedAsbestosClaimsToBeFiled_242EAFB1D6B78CA14187B4A070451B4B" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_LengthInYearsFor95PercentOfFutureUnassertedClaimsToBeFiled" xlink:label="loc_bni_LengthInYearsFor95PercentOfFutureUnassertedClaimsToBeFiled_3952AAD67B829908CBCBB4A0704530AA" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyEstimateAbstract_7B9C84822907E5368D8DB4A070450BF5" xlink:to="loc_bni_LengthInYearsFor95PercentOfFutureUnassertedClaimsToBeFiled_3952AAD67B829908CBCBB4A0704530AA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingencyAccrualCarryingValueCurrent" xlink:label="loc_us-gaap_LossContingencyAccrualCarryingValueCurrent_EB94A9C2676A49AF39BDB4A07045C404" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyEstimateAbstract_7B9C84822907E5368D8DB4A070450BF5" xlink:to="loc_us-gaap_LossContingencyAccrualCarryingValueCurrent_EB94A9C2676A49AF39BDB4A07045C404" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingencyRangeOfPossibleLossMinimum" xlink:label="loc_us-gaap_LossContingencyRangeOfPossibleLossMinimum_E8977F72CC86FBF56985B4A07045AB55" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyEstimateAbstract_7B9C84822907E5368D8DB4A070450BF5" xlink:to="loc_us-gaap_LossContingencyRangeOfPossibleLossMinimum_E8977F72CC86FBF56985B4A07045AB55" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingencyRangeOfPossibleLossMaximum" xlink:label="loc_us-gaap_LossContingencyRangeOfPossibleLossMaximum_007C9CAC4E61E1380F79B4A07045CE62" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyEstimateAbstract_7B9C84822907E5368D8DB4A070450BF5" xlink:to="loc_us-gaap_LossContingencyRangeOfPossibleLossMaximum_007C9CAC4E61E1380F79B4A07045CE62" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingencyAccrualRollForward" xlink:label="loc_us-gaap_LossContingencyAccrualRollForward_BBCA6EB7DAA2E8F85DACB4A0704587A9" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_FF45E826548DEF4D9F62B4A070458718" xlink:to="loc_us-gaap_LossContingencyAccrualRollForward_BBCA6EB7DAA2E8F85DACB4A0704587A9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingencyAccrualAtCarryingValue" xlink:label="loc_us-gaap_LossContingencyAccrualAtCarryingValue_0C2DD204C4C77595C9FEB4A070453DEA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyAccrualRollForward_BBCA6EB7DAA2E8F85DACB4A0704587A9" xlink:to="loc_us-gaap_LossContingencyAccrualAtCarryingValue_0C2DD204C4C77595C9FEB4A070453DEA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingencyAccrualProvision" xlink:label="loc_us-gaap_LossContingencyAccrualProvision_4E573B5F85DBBC39D708B4A0704543D1" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyAccrualRollForward_BBCA6EB7DAA2E8F85DACB4A0704587A9" xlink:to="loc_us-gaap_LossContingencyAccrualProvision_4E573B5F85DBBC39D708B4A0704543D1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingencyAccrualCarryingValuePayments" xlink:label="loc_us-gaap_LossContingencyAccrualCarryingValuePayments_921B758F0AF49FD7B760B4A07045D061" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyAccrualRollForward_BBCA6EB7DAA2E8F85DACB4A0704587A9" xlink:to="loc_us-gaap_LossContingencyAccrualCarryingValuePayments_921B758F0AF49FD7B760B4A07045D061" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.bnsf.com/role/CommitmentsAndContingenciesTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.bnsf.com/role/ComprehensiveIncome" xlink:type="extended" />
  <definitionLink xlink:role="http://www.bnsf.com/role/ComprehensiveIncomeTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.bnsf.com/role/ConsolidatedBalanceSheets" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_43586B8BB419C49C4669B4A07093A5BE" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_88E24040D388EC2774A8B4A070935E84" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_43586B8BB419C49C4669B4A07093A5BE" xlink:to="loc_us-gaap_StatementTable_88E24040D388EC2774A8B4A070935E84" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_F427216A8543E221E086B4A070936528" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_88E24040D388EC2774A8B4A070935E84" xlink:to="loc_us-gaap_StatementScenarioAxis_F427216A8543E221E086B4A070936528" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_FEA1F31EDEC5C3D47487B4A07093E921_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_F427216A8543E221E086B4A070936528" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_FEA1F31EDEC5C3D47487B4A07093E921_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_FEA1F31EDEC5C3D47487B4A07093E921" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_F427216A8543E221E086B4A070936528" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_FEA1F31EDEC5C3D47487B4A07093E921" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_A972B3875546E6E13D01B4A070938949" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_43586B8BB419C49C4669B4A07093A5BE" xlink:to="loc_us-gaap_AssetsAbstract_A972B3875546E6E13D01B4A070938949" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="loc_us-gaap_AssetsCurrentAbstract_6FBFAEDD35A9468EC558B4A07093554E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_A972B3875546E6E13D01B4A070938949" xlink:to="loc_us-gaap_AssetsCurrentAbstract_6FBFAEDD35A9468EC558B4A07093554E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_0A86A16F8142008FF926B4A07093EB2C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_6FBFAEDD35A9468EC558B4A07093554E" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_0A86A16F8142008FF926B4A07093EB2C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_B931214B9BAE9F53D132B4A070936A2C" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_6FBFAEDD35A9468EC558B4A07093554E" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_B931214B9BAE9F53D132B4A070936A2C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MaterialsSuppliesAndOther" xlink:label="loc_us-gaap_MaterialsSuppliesAndOther_5C34C4E81292DD78CF90B4A070938472" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_6FBFAEDD35A9468EC558B4A07093554E" xlink:to="loc_us-gaap_MaterialsSuppliesAndOther_5C34C4E81292DD78CF90B4A070938472" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsNetCurrent" xlink:label="loc_us-gaap_DeferredTaxAssetsNetCurrent_7A6815F19DFA24DE6751B4A07093A785" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_6FBFAEDD35A9468EC558B4A07093554E" xlink:to="loc_us-gaap_DeferredTaxAssetsNetCurrent_7A6815F19DFA24DE6751B4A07093A785" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="loc_us-gaap_OtherAssetsCurrent_A19774390B36F3CEFB18B4A070937591" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_6FBFAEDD35A9468EC558B4A07093554E" xlink:to="loc_us-gaap_OtherAssetsCurrent_A19774390B36F3CEFB18B4A070937591" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_B2BF24CE97A0744128B4B4A07093DC7B" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_6FBFAEDD35A9468EC558B4A07093554E" xlink:to="loc_us-gaap_AssetsCurrent_B2BF24CE97A0744128B4B4A07093DC7B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_47BDC446702D1D4A8566B4A0709352CB" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_A972B3875546E6E13D01B4A070938949" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_47BDC446702D1D4A8566B4A0709352CB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_985A1ECF5B07B341C9BEB4A07093137A" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_A972B3875546E6E13D01B4A070938949" xlink:to="loc_us-gaap_Goodwill_985A1ECF5B07B341C9BEB4A07093137A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_131D8B4E1F48D6F05BEBB4A070934602" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_A972B3875546E6E13D01B4A070938949" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_131D8B4E1F48D6F05BEBB4A070934602" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_005F35C2EB33DFED39E2B4A070932CD7" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_A972B3875546E6E13D01B4A070938949" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_005F35C2EB33DFED39E2B4A070932CD7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_FB0C87D975B2E8D9310AB4A07093A12E" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_A972B3875546E6E13D01B4A070938949" xlink:to="loc_us-gaap_Assets_FB0C87D975B2E8D9310AB4A07093A12E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_2A01ACEE866493CCD60EB4A07093EB37" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_43586B8BB419C49C4669B4A07093A5BE" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_2A01ACEE866493CCD60EB4A07093EB37" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_556810755AC910951B17B4A07093D3CC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_2A01ACEE866493CCD60EB4A07093EB37" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_556810755AC910951B17B4A07093D3CC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_0D5F916D93057323FFD8B4A07093ECB2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_556810755AC910951B17B4A07093D3CC" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_0D5F916D93057323FFD8B4A07093ECB2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_B626286CECB106ED921DB4A070936026" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_556810755AC910951B17B4A07093D3CC" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_B626286CECB106ED921DB4A070936026" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_3C39C22B4A794D176A5EB4A07093692E" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_556810755AC910951B17B4A07093D3CC" xlink:to="loc_us-gaap_LiabilitiesCurrent_3C39C22B4A794D176A5EB4A07093692E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxLiabilitiesNoncurrent" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesNoncurrent_55AC9623909257C456FAB4A070938134" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_2A01ACEE866493CCD60EB4A07093EB37" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesNoncurrent_55AC9623909257C456FAB4A070938134" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_D7638D7AF2ACD67C6C53B4A070930B01" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_2A01ACEE866493CCD60EB4A07093EB37" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_D7638D7AF2ACD67C6C53B4A070930B01" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_IntangibleLiabilitiesNet" xlink:label="loc_bni_IntangibleLiabilitiesNet_AFD7F607F87A5D060767B4A070933F64" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_2A01ACEE866493CCD60EB4A07093EB37" xlink:to="loc_bni_IntangibleLiabilitiesNet_AFD7F607F87A5D060767B4A070933F64" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_CasualtyAndEnvironmentalLiabilities" xlink:label="loc_bni_CasualtyAndEnvironmentalLiabilities_375849ABD0A37DE6BC56B4A07093E9CC" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_2A01ACEE866493CCD60EB4A07093EB37" xlink:to="loc_bni_CasualtyAndEnvironmentalLiabilities_375849ABD0A37DE6BC56B4A07093E9CC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_B52C604A35D760E7FD6DB4A07093004A" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_2A01ACEE866493CCD60EB4A07093EB37" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_B52C604A35D760E7FD6DB4A07093004A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_C190EADC855F5CA5D43BB4A07093AB13" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_2A01ACEE866493CCD60EB4A07093EB37" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_C190EADC855F5CA5D43BB4A07093AB13" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_D8F882CB85D21F531631B4A07093627D" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_2A01ACEE866493CCD60EB4A07093EB37" xlink:to="loc_us-gaap_Liabilities_D8F882CB85D21F531631B4A07093627D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="loc_us-gaap_CommitmentsAndContingencies_D4D10A9B623C47985B4DB4A070933EE0" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_2A01ACEE866493CCD60EB4A07093EB37" xlink:to="loc_us-gaap_CommitmentsAndContingencies_D4D10A9B623C47985B4DB4A070933EE0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="loc_us-gaap_StockholdersEquityAbstract_24F9E3108205F7745B7DB4A070939D6B" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_2A01ACEE866493CCD60EB4A07093EB37" xlink:to="loc_us-gaap_StockholdersEquityAbstract_24F9E3108205F7745B7DB4A070939D6B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStocksIncludingAdditionalPaidInCapital" xlink:label="loc_us-gaap_CommonStocksIncludingAdditionalPaidInCapital_7BEE282E911EE52C268FB4A070935964" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_24F9E3108205F7745B7DB4A070939D6B" xlink:to="loc_us-gaap_CommonStocksIncludingAdditionalPaidInCapital_7BEE282E911EE52C268FB4A070935964" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_382DF254B03E08085D43B4A07093F619" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_24F9E3108205F7745B7DB4A070939D6B" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_382DF254B03E08085D43B4A07093F619" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NotesReceivableRelatedPartiesNoncurrent" xlink:label="loc_us-gaap_NotesReceivableRelatedPartiesNoncurrent_30B178FD680A386057A2B4A070937221" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_24F9E3108205F7745B7DB4A070939D6B" xlink:to="loc_us-gaap_NotesReceivableRelatedPartiesNoncurrent_30B178FD680A386057A2B4A070937221" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_B6F3AEE7EEB5DF011C6DB4A070933DE9" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_24F9E3108205F7745B7DB4A070939D6B" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_B6F3AEE7EEB5DF011C6DB4A070933DE9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_2D9C09C18487BD39768CB4A070932D01" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_24F9E3108205F7745B7DB4A070939D6B" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_2D9C09C18487BD39768CB4A070932D01" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_B1BAA7D4188AFC2DE945B4A0709369E6" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_2A01ACEE866493CCD60EB4A07093EB37" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_B1BAA7D4188AFC2DE945B4A0709369E6" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.bnsf.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_967416F10F4C102AB236B4A07083FD05" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_67E8BDE7801BF7C4C260B4A070834C7F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_967416F10F4C102AB236B4A07083FD05" xlink:to="loc_us-gaap_StatementTable_67E8BDE7801BF7C4C260B4A070834C7F" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_00B586258EB76EE878CAB4A0708372EE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_67E8BDE7801BF7C4C260B4A070834C7F" xlink:to="loc_us-gaap_StatementScenarioAxis_00B586258EB76EE878CAB4A0708372EE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_7143B5A09DCAA2625604B4A07083C266_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_00B586258EB76EE878CAB4A0708372EE" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_7143B5A09DCAA2625604B4A07083C266_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_7143B5A09DCAA2625604B4A07083C266" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_00B586258EB76EE878CAB4A0708372EE" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_7143B5A09DCAA2625604B4A07083C266" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_47D1894641C38D8BD8F4B4A070834687" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_967416F10F4C102AB236B4A07083FD05" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_47D1894641C38D8BD8F4B4A070834687" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="loc_us-gaap_StockholdersEquityAbstract_D3A7B3B3ECFA701C49A8B4A07083DE5C" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_967416F10F4C102AB236B4A07083FD05" xlink:to="loc_us-gaap_StockholdersEquityAbstract_D3A7B3B3ECFA701C49A8B4A07083DE5C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_D52DCA5413F73F24462AB4A070830BE0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_D3A7B3B3ECFA701C49A8B4A07083DE5C" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_D52DCA5413F73F24462AB4A070830BE0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_B2B699FF93B5A951E789B4A070831FC6" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_D3A7B3B3ECFA701C49A8B4A07083DE5C" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_B2B699FF93B5A951E789B4A070831FC6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaap_CommonStockSharesIssued_C1A819B7BCB1A1A2B9D1B4A070833FA7" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_D3A7B3B3ECFA701C49A8B4A07083DE5C" xlink:to="loc_us-gaap_CommonStockSharesIssued_C1A819B7BCB1A1A2B9D1B4A070833FA7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_25DD757EA1A9E3E45ACFB4A07083692F" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_D3A7B3B3ECFA701C49A8B4A07083DE5C" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_25DD757EA1A9E3E45ACFB4A07083692F" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.bnsf.com/role/ConsolidatedStatementsOfCashFlows" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_611CBBA6CBA251868ED9B4A07083B2B4" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_BE8CCC03B9C665AA0044B4A07083FE2A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_611CBBA6CBA251868ED9B4A07083B2B4" xlink:to="loc_us-gaap_StatementTable_BE8CCC03B9C665AA0044B4A07083FE2A" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_9FE630FB07AECEC9D3DBB4A07083F4B4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_BE8CCC03B9C665AA0044B4A07083FE2A" xlink:to="loc_us-gaap_StatementScenarioAxis_9FE630FB07AECEC9D3DBB4A07083F4B4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_9041FDE507102513B8EBB4A07083871B_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_9FE630FB07AECEC9D3DBB4A07083F4B4" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_9041FDE507102513B8EBB4A07083871B_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_9041FDE507102513B8EBB4A07083871B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_9FE630FB07AECEC9D3DBB4A07083F4B4" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_9041FDE507102513B8EBB4A07083871B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_1B96269573284A63FBA1B4A0708322B9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_611CBBA6CBA251868ED9B4A07083B2B4" xlink:to="loc_us-gaap_NetIncomeLoss_1B96269573284A63FBA1B4A0708322B9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_49173B82DC1A4EF1E7CCB4A070833755" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_611CBBA6CBA251868ED9B4A07083B2B4" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_49173B82DC1A4EF1E7CCB4A070833755" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_9A9A9550EEA36DD5DEF6B4A07083E2AD" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_49173B82DC1A4EF1E7CCB4A070833755" xlink:to="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_9A9A9550EEA36DD5DEF6B4A07083E2AD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_2B6035007D8D3FA9A564B4A070832375" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_9A9A9550EEA36DD5DEF6B4A07083E2AD" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_2B6035007D8D3FA9A564B4A070832375" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_2C3198512222F6F2CFBAB4A07083305A" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_9A9A9550EEA36DD5DEF6B4A07083E2AD" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_2C3198512222F6F2CFBAB4A07083305A" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_LongTermCasualtyAndEnvironmentalLiabilitiesNet" xlink:label="loc_bni_LongTermCasualtyAndEnvironmentalLiabilitiesNet_06B7D2960A63740660F1B4A07083550E" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_9A9A9550EEA36DD5DEF6B4A07083E2AD" xlink:to="loc_bni_LongTermCasualtyAndEnvironmentalLiabilitiesNet_06B7D2960A63740660F1B4A07083550E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PensionContributions" xlink:label="loc_us-gaap_PensionContributions_CA13913873217AA5F7D3B4A070831598" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_9A9A9550EEA36DD5DEF6B4A07083E2AD" xlink:to="loc_us-gaap_PensionContributions_CA13913873217AA5F7D3B4A070831598" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherOperatingActivitiesCashFlowStatement" xlink:label="loc_us-gaap_OtherOperatingActivitiesCashFlowStatement_1BACDBE739D01F5B5394B4A07083A1C4" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_9A9A9550EEA36DD5DEF6B4A07083E2AD" xlink:to="loc_us-gaap_OtherOperatingActivitiesCashFlowStatement_1BACDBE739D01F5B5394B4A07083A1C4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_946CFF498198BE99290AB4A070838C6C" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_9A9A9550EEA36DD5DEF6B4A07083E2AD" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_946CFF498198BE99290AB4A070838C6C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_0B179A24D19C5929DD4AB4A070835D4D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_946CFF498198BE99290AB4A070838C6C" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_0B179A24D19C5929DD4AB4A070835D4D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInMaterialsAndSupplies" xlink:label="loc_us-gaap_IncreaseDecreaseInMaterialsAndSupplies_348443CE94CB7D90540AB4A0708360D5" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_946CFF498198BE99290AB4A070838C6C" xlink:to="loc_us-gaap_IncreaseDecreaseInMaterialsAndSupplies_348443CE94CB7D90540AB4A0708360D5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInOtherCurrentAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherCurrentAssets_37305656A59B3C57204CB4A07083B4D5" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_946CFF498198BE99290AB4A070838C6C" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherCurrentAssets_37305656A59B3C57204CB4A07083B4D5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_DE38DDD54EE968BABE46B4A070835B54" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_946CFF498198BE99290AB4A070838C6C" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_DE38DDD54EE968BABE46B4A070835B54" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_6BA20D12CC5CE0542C9FB4A07083917E" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_9A9A9550EEA36DD5DEF6B4A07083E2AD" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_6BA20D12CC5CE0542C9FB4A07083917E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_5E65E317C5615FC87ED5B4A07083286B" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_611CBBA6CBA251868ED9B4A07083B2B4" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_5E65E317C5615FC87ED5B4A07083286B" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_CapitalExpendituresExcludingEquipment" xlink:label="loc_bni_CapitalExpendituresExcludingEquipment_20FA18474172E18494C3B4A070837D0B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_5E65E317C5615FC87ED5B4A07083286B" xlink:to="loc_bni_CapitalExpendituresExcludingEquipment_20FA18474172E18494C3B4A070837D0B" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_AcquisitionOfEquipment" xlink:label="loc_bni_AcquisitionOfEquipment_7D8CF63E4D6141AD3BC4B4A070830C6F" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_5E65E317C5615FC87ED5B4A07083286B" xlink:to="loc_bni_AcquisitionOfEquipment_7D8CF63E4D6141AD3BC4B4A070830C6F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_8CB5D3815D21FA941044B4A0708398DF" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_5E65E317C5615FC87ED5B4A07083286B" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_8CB5D3815D21FA941044B4A0708398DF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_8B6754300F463AF31459B4A07083834E" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_5E65E317C5615FC87ED5B4A07083286B" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_8B6754300F463AF31459B4A07083834E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4169DA67DF829BC079C8B4A070832F44" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_611CBBA6CBA251868ED9B4A07083B2B4" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4169DA67DF829BC079C8B4A070832F44" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_DF65A2FCB7976D2598C8B4A070835E3D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4169DA67DF829BC079C8B4A070832F44" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_DF65A2FCB7976D2598C8B4A070835E3D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInNotesReceivableRelatedParties" xlink:label="loc_us-gaap_IncreaseDecreaseInNotesReceivableRelatedParties_3BFC14418B9D7FE16EA2B4A07083F490" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4169DA67DF829BC079C8B4A070832F44" xlink:to="loc_us-gaap_IncreaseDecreaseInNotesReceivableRelatedParties_3BFC14418B9D7FE16EA2B4A07083F490" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_BD96899655BE0D781674B4A0708320D0" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4169DA67DF829BC079C8B4A070832F44" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_BD96899655BE0D781674B4A0708320D0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_B3C7040E0E40D9683144B4A07083ACA3" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_611CBBA6CBA251868ED9B4A07083B2B4" xlink:to="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_B3C7040E0E40D9683144B4A07083ACA3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValueAbstract" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValueAbstract_DD6F6291558F4CFC68A6B4A07083BCC6" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_611CBBA6CBA251868ED9B4A07083B2B4" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValueAbstract_DD6F6291558F4CFC68A6B4A07083BCC6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_3AABCC7C162FE31495C4B4A07083BDE2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashAndCashEquivalentsAtCarryingValueAbstract_DD6F6291558F4CFC68A6B4A07083BCC6" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_3AABCC7C162FE31495C4B4A07083BDE2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SupplementalCashFlowInformationAbstract" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_408656524301265E15DBB4A0708304A3" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_611CBBA6CBA251868ED9B4A07083B2B4" xlink:to="loc_us-gaap_SupplementalCashFlowInformationAbstract_408656524301265E15DBB4A0708304A3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestPaidNet" xlink:label="loc_us-gaap_InterestPaidNet_6D08EE768DE8D3770CFFB4A070839348" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_408656524301265E15DBB4A0708304A3" xlink:to="loc_us-gaap_InterestPaidNet_6D08EE768DE8D3770CFFB4A070839348" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CapitalExpendituresIncurredButNotYetPaid" xlink:label="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_E81F6D8FCA4714EED303B4A0708346CB" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_408656524301265E15DBB4A0708304A3" xlink:to="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_E81F6D8FCA4714EED303B4A0708346CB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxesPaidNet" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_B5D7EDC182295B11A894B4A070830BDE" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_408656524301265E15DBB4A0708304A3" xlink:to="loc_us-gaap_IncomeTaxesPaidNet_B5D7EDC182295B11A894B4A070830BDE" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.bnsf.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_E3D119913CD134DB8D2EB4A07074154C" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_5C827C79FD7485F734DDB4A0707427DC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_E3D119913CD134DB8D2EB4A07074154C" xlink:to="loc_us-gaap_StatementTable_5C827C79FD7485F734DDB4A0707427DC" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_14244A608BCF53C227ABB4A07074C5A7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_5C827C79FD7485F734DDB4A0707427DC" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_14244A608BCF53C227ABB4A07074C5A7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_1CED8D5CD60C11AE5CCEB4A0707431D5_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_14244A608BCF53C227ABB4A07074C5A7" xlink:to="loc_us-gaap_EquityComponentDomain_1CED8D5CD60C11AE5CCEB4A0707431D5_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_1CED8D5CD60C11AE5CCEB4A0707431D5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_14244A608BCF53C227ABB4A07074C5A7" xlink:to="loc_us-gaap_EquityComponentDomain_1CED8D5CD60C11AE5CCEB4A0707431D5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember_11DD2E531F91E0F7E4EDB4A0707430FC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_1CED8D5CD60C11AE5CCEB4A0707431D5" xlink:to="loc_us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember_11DD2E531F91E0F7E4EDB4A0707430FC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaap_RetainedEarningsMember_FB3CD81F7F1E3E53A329B4A070746841" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_1CED8D5CD60C11AE5CCEB4A0707431D5" xlink:to="loc_us-gaap_RetainedEarningsMember_FB3CD81F7F1E3E53A329B4A070746841" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_IntercompanynotesreceivableMember" xlink:label="loc_bni_IntercompanynotesreceivableMember_7253B2D24D8341DA8F19B4A07074FDC8" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_1CED8D5CD60C11AE5CCEB4A0707431D5" xlink:to="loc_bni_IntercompanynotesreceivableMember_7253B2D24D8341DA8F19B4A07074FDC8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_08F3969C4A23D05F5854B4A07074CC43" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_1CED8D5CD60C11AE5CCEB4A0707431D5" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_08F3969C4A23D05F5854B4A07074CC43" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_B1A9DA7169BFBE013190B4A07074918A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E3D119913CD134DB8D2EB4A07074154C" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_B1A9DA7169BFBE013190B4A07074918A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_D01887CBFAEE64EC6D39B4A07074C9AB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_B1A9DA7169BFBE013190B4A07074918A" xlink:to="loc_us-gaap_StockholdersEquity_D01887CBFAEE64EC6D39B4A07074C9AB" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_IncreaseDecreaseInNotesReceivableClassifiedAsEquityRelatedParties" xlink:label="loc_bni_IncreaseDecreaseInNotesReceivableClassifiedAsEquityRelatedParties_E988A7D3ECD300C2AD2AB4A07074DB1A" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_B1A9DA7169BFBE013190B4A07074918A" xlink:to="loc_bni_IncreaseDecreaseInNotesReceivableClassifiedAsEquityRelatedParties_E988A7D3ECD300C2AD2AB4A07074DB1A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_196AA790F056B6BFB23BB4A07074E00C" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_B1A9DA7169BFBE013190B4A07074918A" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_196AA790F056B6BFB23BB4A07074E00C" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.bnsf.com/role/ConsolidatedStatementsOfComprehensiveIncome" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_F023A855635A9AA6A14AB4A070A3E09C" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_8276D47DF8C9EC1EC614B4A070A32AD2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_F023A855635A9AA6A14AB4A070A3E09C" xlink:to="loc_us-gaap_StatementTable_8276D47DF8C9EC1EC614B4A070A32AD2" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_0050AD6A57B23054BD57B4A070A33B1A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_8276D47DF8C9EC1EC614B4A070A32AD2" xlink:to="loc_us-gaap_StatementScenarioAxis_0050AD6A57B23054BD57B4A070A33B1A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_942A9EDD4098639D42BCB4A070A3CDB2_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_0050AD6A57B23054BD57B4A070A33B1A" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_942A9EDD4098639D42BCB4A070A3CDB2_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_942A9EDD4098639D42BCB4A070A3CDB2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_0050AD6A57B23054BD57B4A070A33B1A" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_942A9EDD4098639D42BCB4A070A3CDB2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_50F3F7FB9DBC3DA33F2FB4A070A33B04" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F023A855635A9AA6A14AB4A070A3E09C" xlink:to="loc_us-gaap_NetIncomeLoss_50F3F7FB9DBC3DA33F2FB4A070A33B04" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_3592D79A38E5484AD7A2B4A070A3EB71" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_F023A855635A9AA6A14AB4A070A3E09C" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_3592D79A38E5484AD7A2B4A070A3EB71" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax_A04BB4906AAC0D27AA23B4A070A3528F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_3592D79A38E5484AD7A2B4A070A3EB71" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax_A04BB4906AAC0D27AA23B4A070A3528F" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_ChangeInOtherComprehensiveIncomeOfEquityMethodInvestees" xlink:label="loc_bni_ChangeInOtherComprehensiveIncomeOfEquityMethodInvestees_904C4A9D5C3DB7F62725B4A070A343C9" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_3592D79A38E5484AD7A2B4A070A3EB71" xlink:to="loc_bni_ChangeInOtherComprehensiveIncomeOfEquityMethodInvestees_904C4A9D5C3DB7F62725B4A070A343C9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_262D80B67D4CBAA7E65AB4A070A3E5E7" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_3592D79A38E5484AD7A2B4A070A3EB71" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_262D80B67D4CBAA7E65AB4A070A3E5E7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_EB79B2F5E92A101CBFA1B4A070A37CDE" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_3592D79A38E5484AD7A2B4A070A3EB71" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_EB79B2F5E92A101CBFA1B4A070A37CDE" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.bnsf.com/role/ConsolidatedStatementsOfComprehensiveIncomeUnauditedParentheticals" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_182C266948FE0E05DB89B4A070A36CF8" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_007173E07C0FBA94E997B4A070A38503" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_182C266948FE0E05DB89B4A070A36CF8" xlink:to="loc_us-gaap_StatementTable_007173E07C0FBA94E997B4A070A38503" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_86A70C2F0735BEF0D74EB4A070A3FDEC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_007173E07C0FBA94E997B4A070A38503" xlink:to="loc_us-gaap_StatementScenarioAxis_86A70C2F0735BEF0D74EB4A070A3FDEC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_21AADE5BE6FB43942F90B4A070A398F9_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_86A70C2F0735BEF0D74EB4A070A3FDEC" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_21AADE5BE6FB43942F90B4A070A398F9_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_21AADE5BE6FB43942F90B4A070A398F9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_86A70C2F0735BEF0D74EB4A070A3FDEC" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_21AADE5BE6FB43942F90B4A070A398F9" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_ChangeInUnrecognizedPriorServiceCreditAndActuarialLossesTaxBenefitExpense" xlink:label="loc_bni_ChangeInUnrecognizedPriorServiceCreditAndActuarialLossesTaxBenefitExpense_AE6444189B1DE2E19D94B4A070A3DC70" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_182C266948FE0E05DB89B4A070A36CF8" xlink:to="loc_bni_ChangeInUnrecognizedPriorServiceCreditAndActuarialLossesTaxBenefitExpense_AE6444189B1DE2E19D94B4A070A3DC70" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.bnsf.com/role/ConsolidatedStatementsOfIncome" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_5A95ADBA01D722A0D425B4A070B2CACE" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_12933C99FC29822A7C7EB4A070B25283" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_5A95ADBA01D722A0D425B4A070B2CACE" xlink:to="loc_us-gaap_StatementTable_12933C99FC29822A7C7EB4A070B25283" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_3A2CEC9AB28F836BFDD8B4A070B27FB4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_12933C99FC29822A7C7EB4A070B25283" xlink:to="loc_us-gaap_StatementScenarioAxis_3A2CEC9AB28F836BFDD8B4A070B27FB4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_38824EEBA4B6231F0A90B4A070B21ED3_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_3A2CEC9AB28F836BFDD8B4A070B27FB4" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_38824EEBA4B6231F0A90B4A070B21ED3_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_38824EEBA4B6231F0A90B4A070B21ED3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_3A2CEC9AB28F836BFDD8B4A070B27FB4" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_38824EEBA4B6231F0A90B4A070B21ED3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SalesRevenueNet" xlink:label="loc_us-gaap_SalesRevenueNet_3E9381E03704DEA53496B4A070B2E339" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5A95ADBA01D722A0D425B4A070B2CACE" xlink:to="loc_us-gaap_SalesRevenueNet_3E9381E03704DEA53496B4A070B2E339" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="loc_us-gaap_OperatingExpensesAbstract_9239BFA16A64F1C93A2AB4A070B262A0" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5A95ADBA01D722A0D425B4A070B2CACE" xlink:to="loc_us-gaap_OperatingExpensesAbstract_9239BFA16A64F1C93A2AB4A070B262A0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LaborAndRelatedExpense" xlink:label="loc_us-gaap_LaborAndRelatedExpense_F93407E9E1D7286D41EAB4A070B287AD" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_9239BFA16A64F1C93A2AB4A070B262A0" xlink:to="loc_us-gaap_LaborAndRelatedExpense_F93407E9E1D7286D41EAB4A070B287AD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FuelCosts" xlink:label="loc_us-gaap_FuelCosts_72D9A142C4481AE064E5B4A070B2C7D4" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_9239BFA16A64F1C93A2AB4A070B262A0" xlink:to="loc_us-gaap_FuelCosts_72D9A142C4481AE064E5B4A070B2C7D4" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_PurchasedServices" xlink:label="loc_bni_PurchasedServices_918F543218F82E29B8CCB4A070B2C385" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_9239BFA16A64F1C93A2AB4A070B262A0" xlink:to="loc_bni_PurchasedServices_918F543218F82E29B8CCB4A070B2C385" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_056E0C14C654473F77A9B4A070B23A93" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_9239BFA16A64F1C93A2AB4A070B262A0" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_056E0C14C654473F77A9B4A070B23A93" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_EquipmentRents" xlink:label="loc_bni_EquipmentRents_8D1D88AC74506C262795B4A070B214D6" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_9239BFA16A64F1C93A2AB4A070B262A0" xlink:to="loc_bni_EquipmentRents_8D1D88AC74506C262795B4A070B214D6" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_MaterialsAndOther" xlink:label="loc_bni_MaterialsAndOther_F374CFEDF91D37B2F7B6B4A070B24013" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_9239BFA16A64F1C93A2AB4A070B262A0" xlink:to="loc_bni_MaterialsAndOther_F374CFEDF91D37B2F7B6B4A070B24013" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaap_OperatingExpenses_11DA56357EF2EB3BE563B4A070B2E89B" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_9239BFA16A64F1C93A2AB4A070B262A0" xlink:to="loc_us-gaap_OperatingExpenses_11DA56357EF2EB3BE563B4A070B2E89B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_C71880EA51342C2398D0B4A070B275BE" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5A95ADBA01D722A0D425B4A070B2CACE" xlink:to="loc_us-gaap_OperatingIncomeLoss_C71880EA51342C2398D0B4A070B275BE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestAndDebtExpense" xlink:label="loc_us-gaap_InterestAndDebtExpense_633461C2EFC769F4FBE4B4A070B2F652" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5A95ADBA01D722A0D425B4A070B2CACE" xlink:to="loc_us-gaap_InterestAndDebtExpense_633461C2EFC769F4FBE4B4A070B2F652" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_InterestIncomeRelatedParties" xlink:label="loc_bni_InterestIncomeRelatedParties_B0BC73556A1FC93C10AAB4A070B256A3" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5A95ADBA01D722A0D425B4A070B2CACE" xlink:to="loc_bni_InterestIncomeRelatedParties_B0BC73556A1FC93C10AAB4A070B256A3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_CC162CC24F5BF2344338B4A070B2C680" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5A95ADBA01D722A0D425B4A070B2CACE" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_CC162CC24F5BF2344338B4A070B2C680" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_25A0F9D5BAD696B80067B4A070B2C81D" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5A95ADBA01D722A0D425B4A070B2CACE" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_25A0F9D5BAD696B80067B4A070B2C81D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_22D40C9B3AC4DF8B0E47B4A070B23AB5" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5A95ADBA01D722A0D425B4A070B2CACE" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_22D40C9B3AC4DF8B0E47B4A070B23AB5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_040916F024E84AA0C3BDB4A070B2AB50" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5A95ADBA01D722A0D425B4A070B2CACE" xlink:to="loc_us-gaap_NetIncomeLoss_040916F024E84AA0C3BDB4A070B2AB50" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.bnsf.com/role/Debt" xlink:type="extended" />
  <definitionLink xlink:role="http://www.bnsf.com/role/DebtFairValueOfDebtInstrumentsDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.bnsf.com/role/DebtGuaranteesDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GuaranteeObligationsLineItems" xlink:label="loc_us-gaap_GuaranteeObligationsLineItems_053D2DCE75D2E76CE430B4A070552E7B" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfGuaranteeObligationsTable" xlink:label="loc_us-gaap_ScheduleOfGuaranteeObligationsTable_96FAE965E54D476FDCFBB4A07055773B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GuaranteeObligationsLineItems_053D2DCE75D2E76CE430B4A070552E7B" xlink:to="loc_us-gaap_ScheduleOfGuaranteeObligationsTable_96FAE965E54D476FDCFBB4A07055773B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="bni-20140331.xsd#bni_GuaranteeEntityNameAxis" xlink:label="loc_bni_GuaranteeEntityNameAxis_2968E1A0FB4EC1178758B4A070552058" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGuaranteeObligationsTable_96FAE965E54D476FDCFBB4A07055773B" xlink:to="loc_bni_GuaranteeEntityNameAxis_2968E1A0FB4EC1178758B4A070552058" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_GuaranteeEntityNameDomain" xlink:label="loc_bni_GuaranteeEntityNameDomain_FCCF8A0CC3A62F939E3EB4A07055E9E6_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_bni_GuaranteeEntityNameAxis_2968E1A0FB4EC1178758B4A070552058" xlink:to="loc_bni_GuaranteeEntityNameDomain_FCCF8A0CC3A62F939E3EB4A07055E9E6_default" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_GuaranteeEntityNameDomain" xlink:label="loc_bni_GuaranteeEntityNameDomain_FCCF8A0CC3A62F939E3EB4A07055E9E6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_bni_GuaranteeEntityNameAxis_2968E1A0FB4EC1178758B4A070552058" xlink:to="loc_bni_GuaranteeEntityNameDomain_FCCF8A0CC3A62F939E3EB4A07055E9E6" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_KinderMorganEnergyPartnersLPMember" xlink:label="loc_bni_KinderMorganEnergyPartnersLPMember_AE03B346B39269CA07B7B4A07055B882" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bni_GuaranteeEntityNameDomain_FCCF8A0CC3A62F939E3EB4A07055E9E6" xlink:to="loc_bni_KinderMorganEnergyPartnersLPMember_AE03B346B39269CA07B7B4A07055B882" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_ChevronPhillipsChemicalCompanyLpMember" xlink:label="loc_bni_ChevronPhillipsChemicalCompanyLpMember_E58E346E20F04F6954CBB4A07055029A" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bni_GuaranteeEntityNameDomain_FCCF8A0CC3A62F939E3EB4A07055E9E6" xlink:to="loc_bni_ChevronPhillipsChemicalCompanyLpMember_E58E346E20F04F6954CBB4A07055029A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GuaranteeObligationsByNatureAxis" xlink:label="loc_us-gaap_GuaranteeObligationsByNatureAxis_FDA5911183ED4D2D4FADB4A070555A91" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGuaranteeObligationsTable_96FAE965E54D476FDCFBB4A07055773B" xlink:to="loc_us-gaap_GuaranteeObligationsByNatureAxis_FDA5911183ED4D2D4FADB4A070555A91" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GuaranteeObligationsNatureDomain" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_EF047438732C78F47DA9B4A070551718_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_FDA5911183ED4D2D4FADB4A070555A91" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_EF047438732C78F47DA9B4A070551718_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GuaranteeObligationsNatureDomain" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_EF047438732C78F47DA9B4A070551718" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_FDA5911183ED4D2D4FADB4A070555A91" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_EF047438732C78F47DA9B4A070551718" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentGuaranteeMember" xlink:label="loc_us-gaap_PaymentGuaranteeMember_0BBEB27EE800EFCE3E72B4A07055EE30" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_EF047438732C78F47DA9B4A070551718" xlink:to="loc_us-gaap_PaymentGuaranteeMember_0BBEB27EE800EFCE3E72B4A07055EE30" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IndemnificationGuaranteeMember" xlink:label="loc_us-gaap_IndemnificationGuaranteeMember_ACD4A30210D3FD586179B4A07055C42B" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_EF047438732C78F47DA9B4A070551718" xlink:to="loc_us-gaap_IndemnificationGuaranteeMember_ACD4A30210D3FD586179B4A07055C42B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinorityInterestOwnershipPercentageByParent" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_56E1D4EED6F961FC0F98B4A070550984" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsLineItems_053D2DCE75D2E76CE430B4A070552E7B" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_56E1D4EED6F961FC0F98B4A070550984" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_PrincipalAmountGuaranteed" xlink:label="loc_bni_PrincipalAmountGuaranteed_31165A0A758C215DE17FB4A07055B476" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsLineItems_053D2DCE75D2E76CE430B4A070552E7B" xlink:to="loc_bni_PrincipalAmountGuaranteed_31165A0A758C215DE17FB4A07055B476" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GuaranteeObligationsMaximumExposure" xlink:label="loc_us-gaap_GuaranteeObligationsMaximumExposure_72FDAE0E2E726B1FE61FB4A070553AAD" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsLineItems_053D2DCE75D2E76CE430B4A070552E7B" xlink:to="loc_us-gaap_GuaranteeObligationsMaximumExposure_72FDAE0E2E726B1FE61FB4A070553AAD" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_MaximumRecourseAmount" xlink:label="loc_bni_MaximumRecourseAmount_15203FF2C58AB45827A9B4A07055B521" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsLineItems_053D2DCE75D2E76CE430B4A070552E7B" xlink:to="loc_bni_MaximumRecourseAmount_15203FF2C58AB45827A9B4A07055B521" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_RemainingTerm" xlink:label="loc_bni_RemainingTerm_FA6FE50555FCFF8CA778B4A070555F14" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsLineItems_053D2DCE75D2E76CE430B4A070552E7B" xlink:to="loc_bni_RemainingTerm_FA6FE50555FCFF8CA778B4A070555F14" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GuaranteeObligationsCurrentCarryingValue" xlink:label="loc_us-gaap_GuaranteeObligationsCurrentCarryingValue_5C2929DA1A98A8DB0D03B4A07055D248" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsLineItems_053D2DCE75D2E76CE430B4A070552E7B" xlink:to="loc_us-gaap_GuaranteeObligationsCurrentCarryingValue_5C2929DA1A98A8DB0D03B4A07055D248" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.bnsf.com/role/DebtTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.bnsf.com/role/DebtVariableInterestEntitiesLeasesDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasedAssetsLineItems" xlink:label="loc_us-gaap_OperatingLeasedAssetsLineItems_16875879688EECC36997B4A07045D337" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfOperatingLeasedAssetsTable" xlink:label="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_F044F9968A9883BE2F52B4A070453B58" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_16875879688EECC36997B4A07045D337" xlink:to="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_F044F9968A9883BE2F52B4A070453B58" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis" xlink:label="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_E85CDE5B474BA2FE7BFBB4A070452957" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_F044F9968A9883BE2F52B4A070453B58" xlink:to="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_E85CDE5B474BA2FE7BFBB4A070452957" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassificationOfVariableInterestEntityDomain" xlink:label="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_66294AE5CAF8512F24D8B4A070457B3C_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_E85CDE5B474BA2FE7BFBB4A070452957" xlink:to="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_66294AE5CAF8512F24D8B4A070457B3C_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassificationOfVariableInterestEntityDomain" xlink:label="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_66294AE5CAF8512F24D8B4A070457B3C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_E85CDE5B474BA2FE7BFBB4A070452957" xlink:to="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_66294AE5CAF8512F24D8B4A070457B3C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember" xlink:label="loc_us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember_1921B9661F8FF42CA7D5B4A070450FA8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_66294AE5CAF8512F24D8B4A070457B3C" xlink:to="loc_us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember_1921B9661F8FF42CA7D5B4A070450FA8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PartiesToContractualArrangementAxis" xlink:label="loc_us-gaap_PartiesToContractualArrangementAxis_A920F5F8175D4F3BDA97B4A07045FCCF" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_F044F9968A9883BE2F52B4A070453B58" xlink:to="loc_us-gaap_PartiesToContractualArrangementAxis_A920F5F8175D4F3BDA97B4A07045FCCF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PartiesToContractualArrangementMember" xlink:label="loc_us-gaap_PartiesToContractualArrangementMember_C5D0EB4CF15CE0612DFFB4A070450BD6_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PartiesToContractualArrangementAxis_A920F5F8175D4F3BDA97B4A07045FCCF" xlink:to="loc_us-gaap_PartiesToContractualArrangementMember_C5D0EB4CF15CE0612DFFB4A070450BD6_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PartiesToContractualArrangementMember" xlink:label="loc_us-gaap_PartiesToContractualArrangementMember_C5D0EB4CF15CE0612DFFB4A070450BD6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PartiesToContractualArrangementAxis_A920F5F8175D4F3BDA97B4A07045FCCF" xlink:to="loc_us-gaap_PartiesToContractualArrangementMember_C5D0EB4CF15CE0612DFFB4A070450BD6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ReportingEntityMember" xlink:label="loc_us-gaap_ReportingEntityMember_C4E8650267D031DD1A3DB4A070450180" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartiesToContractualArrangementMember_C5D0EB4CF15CE0612DFFB4A070450BD6" xlink:to="loc_us-gaap_ReportingEntityMember_C4E8650267D031DD1A3DB4A070450180" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_B2C1CF0656CE3CE789B1B4A0704565B8" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_F044F9968A9883BE2F52B4A070453B58" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_B2C1CF0656CE3CE789B1B4A0704565B8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_53FE9260D5520EEF1014B4A070456736_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_B2C1CF0656CE3CE789B1B4A0704565B8" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_53FE9260D5520EEF1014B4A070456736_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_53FE9260D5520EEF1014B4A070456736" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_B2C1CF0656CE3CE789B1B4A0704565B8" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_53FE9260D5520EEF1014B4A070456736" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquipmentMember" xlink:label="loc_us-gaap_EquipmentMember_5161D9373116BF9DF30DB4A070453DFF" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_53FE9260D5520EEF1014B4A070456736" xlink:to="loc_us-gaap_EquipmentMember_5161D9373116BF9DF30DB4A070453DFF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDue" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_8374D613F1E64F5F21C3B4A07045B62A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_16875879688EECC36997B4A07045D337" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_8374D613F1E64F5F21C3B4A07045B62A" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.bnsf.com/role/DocumentAndEntityInformation" xlink:type="extended">
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityInformationLineItems" xlink:label="loc_dei_EntityInformationLineItems_4499A2793FAEAC934641E62953D46702" xlink:type="locator" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntitiesTable" xlink:label="loc_dei_EntitiesTable_397DD0451C47C8E0FCF4E62953D43D31" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_4499A2793FAEAC934641E62953D46702" xlink:to="loc_dei_EntitiesTable_397DD0451C47C8E0FCF4E62953D43D31" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_B6069DBAE35EE2056704E62953D45977" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_397DD0451C47C8E0FCF4E62953D43D31" xlink:to="loc_dei_LegalEntityAxis_B6069DBAE35EE2056704E62953D45977" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_AAF5BC1FF56D37A2F8B3E62953D4A415_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_B6069DBAE35EE2056704E62953D45977" xlink:to="loc_dei_EntityDomain_AAF5BC1FF56D37A2F8B3E62953D4A415_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_AAF5BC1FF56D37A2F8B3E62953D4A415" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_B6069DBAE35EE2056704E62953D45977" xlink:to="loc_dei_EntityDomain_AAF5BC1FF56D37A2F8B3E62953D4A415" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityRegistrantName" xlink:label="loc_dei_EntityRegistrantName_C69D323590BDE482EE84E62953D4DB91" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4499A2793FAEAC934641E62953D46702" xlink:to="loc_dei_EntityRegistrantName_C69D323590BDE482EE84E62953D4DB91" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="loc_dei_EntityCentralIndexKey_4B9B2574F1E9D8B5156DE62953D46E4F" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4499A2793FAEAC934641E62953D46702" xlink:to="loc_dei_EntityCentralIndexKey_4B9B2574F1E9D8B5156DE62953D46E4F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentType" xlink:label="loc_dei_DocumentType_5BCFE7720CD02EBA8A33E62953D42CFD" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4499A2793FAEAC934641E62953D46702" xlink:to="loc_dei_DocumentType_5BCFE7720CD02EBA8A33E62953D42CFD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="loc_dei_DocumentPeriodEndDate_7DD156D9408ECCCA5EB8E62953D4FEFD" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4499A2793FAEAC934641E62953D46702" xlink:to="loc_dei_DocumentPeriodEndDate_7DD156D9408ECCCA5EB8E62953D4FEFD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_AmendmentFlag" xlink:label="loc_dei_AmendmentFlag_307CEA0EC744A07BF196E62953D4B3C4" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4499A2793FAEAC934641E62953D46702" xlink:to="loc_dei_AmendmentFlag_307CEA0EC744A07BF196E62953D4B3C4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentFiscalYearFocus" xlink:label="loc_dei_DocumentFiscalYearFocus_013E6FB6F6345993A396E62953D44B67" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4499A2793FAEAC934641E62953D46702" xlink:to="loc_dei_DocumentFiscalYearFocus_013E6FB6F6345993A396E62953D44B67" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="loc_dei_DocumentFiscalPeriodFocus_0353C6AE221080DCC02FE62953D4C872" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4499A2793FAEAC934641E62953D46702" xlink:to="loc_dei_DocumentFiscalPeriodFocus_0353C6AE221080DCC02FE62953D4C872" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_CurrentFiscalYearEndDate" xlink:label="loc_dei_CurrentFiscalYearEndDate_0C3AD14D74936C592F13E62953D4F6C0" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4499A2793FAEAC934641E62953D46702" xlink:to="loc_dei_CurrentFiscalYearEndDate_0C3AD14D74936C592F13E62953D4F6C0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityWellKnownSeasonedIssuer" xlink:label="loc_dei_EntityWellKnownSeasonedIssuer_75C2F3806FC25BAF7814E62953D4F5E5" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4499A2793FAEAC934641E62953D46702" xlink:to="loc_dei_EntityWellKnownSeasonedIssuer_75C2F3806FC25BAF7814E62953D4F5E5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityVoluntaryFilers" xlink:label="loc_dei_EntityVoluntaryFilers_C79C8D847697CE98B6B0E62953D4651D" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4499A2793FAEAC934641E62953D46702" xlink:to="loc_dei_EntityVoluntaryFilers_C79C8D847697CE98B6B0E62953D4651D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityCurrentReportingStatus" xlink:label="loc_dei_EntityCurrentReportingStatus_5CDA641C94908573E8C5E62953D4969B" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4499A2793FAEAC934641E62953D46702" xlink:to="loc_dei_EntityCurrentReportingStatus_5CDA641C94908573E8C5E62953D4969B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityFilerCategory" xlink:label="loc_dei_EntityFilerCategory_CD4BB29A28A70CF50AC2E62953D46BD9" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4499A2793FAEAC934641E62953D46702" xlink:to="loc_dei_EntityFilerCategory_CD4BB29A28A70CF50AC2E62953D46BD9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_10AC54CAE36998AEDEFAE62953D4CEC1" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4499A2793FAEAC934641E62953D46702" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_10AC54CAE36998AEDEFAE62953D4CEC1" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.bnsf.com/role/EmploymentBenefitPlans" xlink:type="extended" />
  <definitionLink xlink:role="http://www.bnsf.com/role/EmploymentBenefitPlansDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_FAF5A0E6D53627A1EF92B4A06FF76A7D" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_EB29B1CA234A3029EF7FB4A06FF792B1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_FAF5A0E6D53627A1EF92B4A06FF76A7D" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_EB29B1CA234A3029EF7FB4A06FF792B1" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="loc_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_B8D5B9FF2378780B70CFB4A06FF78549" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_EB29B1CA234A3029EF7FB4A06FF792B1" xlink:to="loc_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_B8D5B9FF2378780B70CFB4A06FF78549" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="loc_us-gaap_DefinedBenefitPlansDomain_03F9A71BD167D41C26B1B4A06FF7FBB0_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_B8D5B9FF2378780B70CFB4A06FF78549" xlink:to="loc_us-gaap_DefinedBenefitPlansDomain_03F9A71BD167D41C26B1B4A06FF7FBB0_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="loc_us-gaap_DefinedBenefitPlansDomain_03F9A71BD167D41C26B1B4A06FF7FBB0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_B8D5B9FF2378780B70CFB4A06FF78549" xlink:to="loc_us-gaap_DefinedBenefitPlansDomain_03F9A71BD167D41C26B1B4A06FF7FBB0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_BE1D4CA2B943FAEA455FB4A06FF768FB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansDomain_03F9A71BD167D41C26B1B4A06FF7FBB0" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_BE1D4CA2B943FAEA455FB4A06FF768FB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_261D6AC574ADA3BB7C03B4A06FF740FB" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansDomain_03F9A71BD167D41C26B1B4A06FF7FBB0" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_261D6AC574ADA3BB7C03B4A06FF740FB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_421989195B40EDEF2CEAB4A06FF7050A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_FAF5A0E6D53627A1EF92B4A06FF76A7D" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_421989195B40EDEF2CEAB4A06FF7050A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_9D63AF3D92D06CB6F523B4A06FF7BE1A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_421989195B40EDEF2CEAB4A06FF7050A" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_9D63AF3D92D06CB6F523B4A06FF7BE1A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_96862EF27BA5D805F9D0B4A06FF768BA" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_421989195B40EDEF2CEAB4A06FF7050A" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_96862EF27BA5D805F9D0B4A06FF768BA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_1BA2793CB28D29DCDD98B4A06FF72509" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_421989195B40EDEF2CEAB4A06FF7050A" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_1BA2793CB28D29DCDD98B4A06FF72509" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_DECB892307AD78A4E477B4A06FF723B0" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_421989195B40EDEF2CEAB4A06FF7050A" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_DECB892307AD78A4E477B4A06FF723B0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss" xlink:label="loc_us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss_89F89BC3284A6D8EE6F2B4A06FF7AA56" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_421989195B40EDEF2CEAB4A06FF7050A" xlink:to="loc_us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss_89F89BC3284A6D8EE6F2B4A06FF7AA56" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_B421A6BECC1097B0E2FAB4A06FF7C90A" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_421989195B40EDEF2CEAB4A06FF7050A" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_B421A6BECC1097B0E2FAB4A06FF7C90A" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.bnsf.com/role/EmploymentBenefitPlansTables" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_73FFEB4F8EDAB0ADFD01B4A06FF7BABF" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_1F16BA6733A10CDE6B57B4A06FF7630F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_73FFEB4F8EDAB0ADFD01B4A06FF7BABF" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_1F16BA6733A10CDE6B57B4A06FF7630F" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="loc_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_76F70384301E56D0F9B2B4A06FF7D9D7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_1F16BA6733A10CDE6B57B4A06FF7630F" xlink:to="loc_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_76F70384301E56D0F9B2B4A06FF7D9D7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="loc_us-gaap_DefinedBenefitPlansDomain_7D6C50DCA8D4D5FB9E78B4A06FF73313_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_76F70384301E56D0F9B2B4A06FF7D9D7" xlink:to="loc_us-gaap_DefinedBenefitPlansDomain_7D6C50DCA8D4D5FB9E78B4A06FF73313_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="loc_us-gaap_DefinedBenefitPlansDomain_7D6C50DCA8D4D5FB9E78B4A06FF73313" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_76F70384301E56D0F9B2B4A06FF7D9D7" xlink:to="loc_us-gaap_DefinedBenefitPlansDomain_7D6C50DCA8D4D5FB9E78B4A06FF73313" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_7E645AA6405D2AB2603AB4A06FF781F5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansDomain_7D6C50DCA8D4D5FB9E78B4A06FF73313" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_7E645AA6405D2AB2603AB4A06FF781F5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_248AC69C135D6B82B434B4A06FF7549A" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansDomain_7D6C50DCA8D4D5FB9E78B4A06FF73313" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_248AC69C135D6B82B434B4A06FF7549A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfNetBenefitCostsTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfNetBenefitCostsTableTextBlock_DB9853AB6496CA048063B4A06FF740CB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_73FFEB4F8EDAB0ADFD01B4A06FF7BABF" xlink:to="loc_us-gaap_ScheduleOfNetBenefitCostsTableTextBlock_DB9853AB6496CA048063B4A06FF740CB" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.bnsf.com/role/OtherAssets" xlink:type="extended" />
  <definitionLink xlink:role="http://www.bnsf.com/role/OtherAssetsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_VariableInterestEntityLineItems" xlink:label="loc_us-gaap_VariableInterestEntityLineItems_CE207A52F3A8F5ADBB6FB4A07055BC60" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfVariableInterestEntitiesTable" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_85354CF314665B9656A5B4A070555949" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_CE207A52F3A8F5ADBB6FB4A07055BC60" xlink:to="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_85354CF314665B9656A5B4A070555949" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis" xlink:label="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_6B587A09A64899992486B4A07055B6C3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_85354CF314665B9656A5B4A070555949" xlink:to="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_6B587A09A64899992486B4A07055B6C3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassificationOfVariableInterestEntityDomain" xlink:label="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_A18C3191DB3F4C273CE0B4A07055A60C_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_6B587A09A64899992486B4A07055B6C3" xlink:to="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_A18C3191DB3F4C273CE0B4A07055A60C_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassificationOfVariableInterestEntityDomain" xlink:label="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_A18C3191DB3F4C273CE0B4A07055A60C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_6B587A09A64899992486B4A07055B6C3" xlink:to="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_A18C3191DB3F4C273CE0B4A07055A60C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember" xlink:label="loc_us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember_25684D14BE09ABFC31FBB4A07055F2E3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_A18C3191DB3F4C273CE0B4A07055A60C" xlink:to="loc_us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember_25684D14BE09ABFC31FBB4A07055F2E3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_5A4778590E20D5B838AAB4A070557B8A" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_A18C3191DB3F4C273CE0B4A07055A60C" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_5A4778590E20D5B838AAB4A070557B8A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_VariableInterestEntityOwnershipPercentage" xlink:label="loc_us-gaap_VariableInterestEntityOwnershipPercentage_D876B236E2E8A3159E93B4A07055EE38" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_CE207A52F3A8F5ADBB6FB4A07055BC60" xlink:to="loc_us-gaap_VariableInterestEntityOwnershipPercentage_D876B236E2E8A3159E93B4A07055EE38" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest" xlink:label="loc_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest_2625722847EE0C830FD4B4A07055615A" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_CE207A52F3A8F5ADBB6FB4A07055BC60" xlink:to="loc_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest_2625722847EE0C830FD4B4A07055615A" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_VariableInterestEntityAssets" xlink:label="loc_bni_VariableInterestEntityAssets_771732A328219C0D2994B4A07055C8DA" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_CE207A52F3A8F5ADBB6FB4A07055BC60" xlink:to="loc_bni_VariableInterestEntityAssets_771732A328219C0D2994B4A07055C8DA" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_VariableInterestEntityNonconsolidatedUnamortizedInvestmentBalance" xlink:label="loc_bni_VariableInterestEntityNonconsolidatedUnamortizedInvestmentBalance_87ABF7BB1519F5995B12B4A07055FBA8" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_CE207A52F3A8F5ADBB6FB4A07055BC60" xlink:to="loc_bni_VariableInterestEntityNonconsolidatedUnamortizedInvestmentBalance_87ABF7BB1519F5995B12B4A07055FBA8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherCommitment" xlink:label="loc_us-gaap_OtherCommitment_B7DB211D0B85E7586D93B4A07055FFDF" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_CE207A52F3A8F5ADBB6FB4A07055BC60" xlink:to="loc_us-gaap_OtherCommitment_B7DB211D0B85E7586D93B4A07055FFDF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount" xlink:label="loc_us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount_4D4083202D74191677E7B4A07055D3DC" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_CE207A52F3A8F5ADBB6FB4A07055BC60" xlink:to="loc_us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount_4D4083202D74191677E7B4A07055D3DC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherCommitmentDueInNextTwelveMonths" xlink:label="loc_us-gaap_OtherCommitmentDueInNextTwelveMonths_68AF1BF92C8B21492E4CB4A070558D64" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_CE207A52F3A8F5ADBB6FB4A07055BC60" xlink:to="loc_us-gaap_OtherCommitmentDueInNextTwelveMonths_68AF1BF92C8B21492E4CB4A070558D64" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.bnsf.com/role/OtherAssetsTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.bnsf.com/role/OtherIntangibleAssetsAndLiabilities" xlink:type="extended" />
  <definitionLink xlink:role="http://www.bnsf.com/role/OtherIntangibleAssetsAndLiabilitiesDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.bnsf.com/role/OtherIntangibleAssetsAndLiabilitiesTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.bnsf.com/role/ReclassificationsOutOfAccumulatedOtherComprehensiveIncomeDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems" xlink:label="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_AEF8BF8F59495B2535C3B49EE0D3F1C8" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_02FCBE250A63E7F20280B49EE0D3B01F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_AEF8BF8F59495B2535C3B49EE0D3F1C8" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_02FCBE250A63E7F20280B49EE0D3B01F" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_1A0E1192113ED90D8061B49EE0D36BC4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_02FCBE250A63E7F20280B49EE0D3B01F" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_1A0E1192113ED90D8061B49EE0D36BC4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_386204D29A1882DC2EB5B49EE0D31084_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_1A0E1192113ED90D8061B49EE0D36BC4" xlink:to="loc_us-gaap_EquityComponentDomain_386204D29A1882DC2EB5B49EE0D31084_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_386204D29A1882DC2EB5B49EE0D31084" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_1A0E1192113ED90D8061B49EE0D36BC4" xlink:to="loc_us-gaap_EquityComponentDomain_386204D29A1882DC2EB5B49EE0D31084" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_10D9D9CBA8A093298134B49EE0D3B4F8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_386204D29A1882DC2EB5B49EE0D31084" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_10D9D9CBA8A093298134B49EE0D3B4F8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_622302420418C2ABF607B49EE0D3B7D1" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_02FCBE250A63E7F20280B49EE0D3B01F" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_622302420418C2ABF607B49EE0D3B7D1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_FACD5CD4165D9DB650ABB49EE0D3B794_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_622302420418C2ABF607B49EE0D3B7D1" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_FACD5CD4165D9DB650ABB49EE0D3B794_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_FACD5CD4165D9DB650ABB49EE0D3B794" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_622302420418C2ABF607B49EE0D3B7D1" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_FACD5CD4165D9DB650ABB49EE0D3B794" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_5F0E753FCB5F5A4D8008B49EE0D35C1D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_FACD5CD4165D9DB650ABB49EE0D3B794" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_5F0E753FCB5F5A4D8008B49EE0D35C1D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax_33148058DFD1202B4F0EB49EE0D39F62" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_AEF8BF8F59495B2535C3B49EE0D3F1C8" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax_33148058DFD1202B4F0EB49EE0D39F62" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax_A35D40B14B3DF766F1C6B49EE0D3626A" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_AEF8BF8F59495B2535C3B49EE0D3F1C8" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax_A35D40B14B3DF766F1C6B49EE0D3626A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_67CEB3DD32805804D4F0B49EE0D3AAC7" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_AEF8BF8F59495B2535C3B49EE0D3F1C8" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_67CEB3DD32805804D4F0B49EE0D3AAC7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_C453F091B22CC9C844ABB49EE0D35A6E" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_AEF8BF8F59495B2535C3B49EE0D3F1C8" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_C453F091B22CC9C844ABB49EE0D35A6E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_050D1921B0378A14C072B49EE0D39FCD" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_AEF8BF8F59495B2535C3B49EE0D3F1C8" xlink:to="loc_us-gaap_NetIncomeLoss_050D1921B0378A14C072B49EE0D39FCD" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.bnsf.com/role/RelatedPartyTransactions" xlink:type="extended" />
  <definitionLink xlink:role="http://www.bnsf.com/role/RelatedPartyTransactionsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RelatedPartyTransactionLineItems" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_633D4620551E694B3EA4B32A80BDF5F6" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_07E3BED22E85E60551C5B32A80BD8C49" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_633D4620551E694B3EA4B32A80BDF5F6" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_07E3BED22E85E60551C5B32A80BD8C49" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="bni-20140331.xsd#bni_VariableDebtRateTypeAxis" xlink:label="loc_bni_VariableDebtRateTypeAxis_9F0F686A999D4703CF79B32A80BD0B9B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_07E3BED22E85E60551C5B32A80BD8C49" xlink:to="loc_bni_VariableDebtRateTypeAxis_9F0F686A999D4703CF79B32A80BD0B9B" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_VariableDebtRateTypeDomain" xlink:label="loc_bni_VariableDebtRateTypeDomain_A171D2D501D5EAEB103DB32A80BDD39F_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_bni_VariableDebtRateTypeAxis_9F0F686A999D4703CF79B32A80BD0B9B" xlink:to="loc_bni_VariableDebtRateTypeDomain_A171D2D501D5EAEB103DB32A80BDD39F_default" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_VariableDebtRateTypeDomain" xlink:label="loc_bni_VariableDebtRateTypeDomain_A171D2D501D5EAEB103DB32A80BDD39F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_bni_VariableDebtRateTypeAxis_9F0F686A999D4703CF79B32A80BD0B9B" xlink:to="loc_bni_VariableDebtRateTypeDomain_A171D2D501D5EAEB103DB32A80BDD39F" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_EffectiveFederalFundsRateMember" xlink:label="loc_bni_EffectiveFederalFundsRateMember_E30AF8592542EB53E77BB32A80BD59D4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bni_VariableDebtRateTypeDomain_A171D2D501D5EAEB103DB32A80BDD39F" xlink:to="loc_bni_EffectiveFederalFundsRateMember_E30AF8592542EB53E77BB32A80BD59D4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_FC589F546A36F4A2D6D2B32A80BD092A" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_07E3BED22E85E60551C5B32A80BD8C49" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_FC589F546A36F4A2D6D2B32A80BD092A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_3E62D1C1F17041DAC34FB32A80BD27DD_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_FC589F546A36F4A2D6D2B32A80BD092A" xlink:to="loc_us-gaap_RelatedPartyDomain_3E62D1C1F17041DAC34FB32A80BD27DD_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_3E62D1C1F17041DAC34FB32A80BD27DD" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_FC589F546A36F4A2D6D2B32A80BD092A" xlink:to="loc_us-gaap_RelatedPartyDomain_3E62D1C1F17041DAC34FB32A80BD27DD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ParentCompanyMember" xlink:label="loc_us-gaap_ParentCompanyMember_4B694CECC385268F9ED1B32A80BD9B0C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_3E62D1C1F17041DAC34FB32A80BD27DD" xlink:to="loc_us-gaap_ParentCompanyMember_4B694CECC385268F9ED1B32A80BD9B0C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AffiliatedEntityMember" xlink:label="loc_us-gaap_AffiliatedEntityMember_71A704E325E9871EDF9DB32A80BDE900" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_3E62D1C1F17041DAC34FB32A80BD27DD" xlink:to="loc_us-gaap_AffiliatedEntityMember_71A704E325E9871EDF9DB32A80BDE900" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_IncomeTaxPaymentsNetOfRefundsToParentByReportingEntity" xlink:label="loc_bni_IncomeTaxPaymentsNetOfRefundsToParentByReportingEntity_D8AF2CE8460B9FE08C00B32A80BDF2D2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_633D4620551E694B3EA4B32A80BDF5F6" xlink:to="loc_bni_IncomeTaxPaymentsNetOfRefundsToParentByReportingEntity_D8AF2CE8460B9FE08C00B32A80BDF2D2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountsReceivableRelatedPartiesCurrent" xlink:label="loc_us-gaap_AccountsReceivableRelatedPartiesCurrent_17B43EE3EDC58F8A621FB32A80BDCD7F" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_633D4620551E694B3EA4B32A80BDF5F6" xlink:to="loc_us-gaap_AccountsReceivableRelatedPartiesCurrent_17B43EE3EDC58F8A621FB32A80BDCD7F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountsPayableRelatedPartiesCurrent" xlink:label="loc_us-gaap_AccountsPayableRelatedPartiesCurrent_C58725A45DB26D895D0BB32A80BDC3B9" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_633D4620551E694B3EA4B32A80BDF5F6" xlink:to="loc_us-gaap_AccountsPayableRelatedPartiesCurrent_C58725A45DB26D895D0BB32A80BDC3B9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NotesReceivableRelatedPartiesNoncurrent" xlink:label="loc_us-gaap_NotesReceivableRelatedPartiesNoncurrent_8E7F58D4485BA05CB93DB32A80BD3B8B" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_633D4620551E694B3EA4B32A80BDF5F6" xlink:to="loc_us-gaap_NotesReceivableRelatedPartiesNoncurrent_8E7F58D4485BA05CB93DB32A80BD3B8B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInNotesReceivableRelatedParties" xlink:label="loc_us-gaap_IncreaseDecreaseInNotesReceivableRelatedParties_5BC2C6C23C81980624C5B32A80BD7E83" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_633D4620551E694B3EA4B32A80BDF5F6" xlink:to="loc_us-gaap_IncreaseDecreaseInNotesReceivableRelatedParties_5BC2C6C23C81980624C5B32A80BD7E83" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_132B1D9D331259557462B32A80BDF524" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_633D4620551E694B3EA4B32A80BDF5F6" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_132B1D9D331259557462B32A80BDF524" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RevenueFromRelatedParties" xlink:label="loc_us-gaap_RevenueFromRelatedParties_E1298C907D832D556511B32A80BDFD4D" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_633D4620551E694B3EA4B32A80BDF5F6" xlink:to="loc_us-gaap_RevenueFromRelatedParties_E1298C907D832D556511B32A80BDFD4D" xlink:type="arc" />
    <loc xlink:href="bni-20140331.xsd#bni_RelatedPartyTransactionExpendituresFromTransactionswithAffiliates" xlink:label="loc_bni_RelatedPartyTransactionExpendituresFromTransactionswithAffiliates_98D0FFF1A0BF47B2E3AAB32A80BD37F8" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_633D4620551E694B3EA4B32A80BDF5F6" xlink:to="loc_bni_RelatedPartyTransactionExpendituresFromTransactionswithAffiliates_98D0FFF1A0BF47B2E3AAB32A80BD37F8" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.bnsf.com/role/RelatedPartyTransactionsTables" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RelatedPartyTransactionLineItems" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_3785B587A09DBB060063B49FE5F18B31" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_E22911882ECDD6630AFDB49FE5F19B7B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_3785B587A09DBB060063B49FE5F18B31" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_E22911882ECDD6630AFDB49FE5F19B7B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_54F7A3B86C368506C5E4B49FE5F11191" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_E22911882ECDD6630AFDB49FE5F19B7B" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_54F7A3B86C368506C5E4B49FE5F11191" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_397C4BE8CF03704EE885B49FE5F1F2FA_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_54F7A3B86C368506C5E4B49FE5F11191" xlink:to="loc_us-gaap_RelatedPartyDomain_397C4BE8CF03704EE885B49FE5F1F2FA_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_397C4BE8CF03704EE885B49FE5F1F2FA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_54F7A3B86C368506C5E4B49FE5F11191" xlink:to="loc_us-gaap_RelatedPartyDomain_397C4BE8CF03704EE885B49FE5F1F2FA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RelatedPartyTransactionAxis" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_B5118D47724CA207BB4DB49FE5F1EBA8" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_E22911882ECDD6630AFDB49FE5F19B7B" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_B5118D47724CA207BB4DB49FE5F1EBA8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RelatedPartyTransactionDomain" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_D61F513D3BAB4D830A86B49FE5F1E92D_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_B5118D47724CA207BB4DB49FE5F1EBA8" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_D61F513D3BAB4D830A86B49FE5F1E92D_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RelatedPartyTransactionDomain" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_D61F513D3BAB4D830A86B49FE5F1E92D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_B5118D47724CA207BB4DB49FE5F1EBA8" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_D61F513D3BAB4D830A86B49FE5F1E92D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock_CC9328975CE54A0B7347B49FE5F19280" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_3785B587A09DBB060063B49FE5F18B31" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock_CC9328975CE54A0B7347B49FE5F19280" xlink:type="arc" />
  </definitionLink>
</linkbase>
