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        <PersonNm>MICHAEL J RUSH</PersonNm>
        <TitleTxt>SVP-SAFETY &amp; OPERATIONS</TitleTxt>
        <AverageHoursPerWeekRt>36.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>4.00</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>402834</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>164350</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>JEFFREY D MARSH</PersonNm>
        <TitleTxt>SVP-FINANCE &amp; CFO</TitleTxt>
        <AverageHoursPerWeekRt>36.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>4.00</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>986203</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>166224</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>PATRICIA M REILLY</PersonNm>
        <TitleTxt>SVP-COMMUNICATIONS</TitleTxt>
        <AverageHoursPerWeekRt>39.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>1.00</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>742945</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>42404</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>JOHN T GRAY</PersonNm>
        <TitleTxt>SVP-POLICY &amp; ECONOMICS</TitleTxt>
        <AverageHoursPerWeekRt>39.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>1.00</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>551413</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>51479</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>KATHY D KIRMAYER</PersonNm>
        <TitleTxt>SVP-LAW &amp; GENERAL COUNSEL</TitleTxt>
        <AverageHoursPerWeekRt>39.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>1.00</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>565277</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>90154</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>IAN N JEFFERIES</PersonNm>
        <TitleTxt>SVP-GOVERNMENT AFFAIRS</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>544301</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>65560</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>JOHN F WETZEL</PersonNm>
        <TitleTxt>VP-GOVERNMENT AFFAIRS</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>97718</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>56827</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>JANET L BARTELMAY</PersonNm>
        <TitleTxt>CORPORATE SECRETARY</TitleTxt>
        <AverageHoursPerWeekRt>39.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>1.00</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>287712</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>96362</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>WILLIAM C THOMPSON</PersonNm>
        <TitleTxt>PROGRAM MANAGER</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>294575</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>72319</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>DANIEL SAPHIRE</PersonNm>
        <TitleTxt>ASSOCIATE GENERAL COUNSEL</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>257342</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>69280</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>KELLEY FRENCH DONLEY</PersonNm>
        <TitleTxt>AVP-MEMBER SERVICES</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>248721</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>66852</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>ROBERT E FRONCZAK</PersonNm>
        <TitleTxt>AVP-ENVIRONMENT/HAZMAT</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>244811</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>41086</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>TIMONTHY J STRAFFORD</PersonNm>
        <TitleTxt>ASSOCIATE GENERAL COUNSEL</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>243640</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>45604</OtherCompensationAmt>
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      <TotalReportableCompFromOrgAmt>12839940</TotalReportableCompFromOrgAmt>
      <TotReportableCompRltdOrgAmt>0</TotReportableCompRltdOrgAmt>
      <TotalOtherCompensationAmt>2217644</TotalOtherCompensationAmt>
      <IndivRcvdGreaterThan100KCnt>47</IndivRcvdGreaterThan100KCnt>
      <FormerOfcrEmployeesListedInd>0</FormerOfcrEmployeesListedInd>
      <TotalCompGreaterThan150KInd>1</TotalCompGreaterThan150KInd>
      <CompensationFromOtherSrcsInd>0</CompensationFromOtherSrcsInd>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>TRANSPORTATION TECHNOLOGY CENTER INC</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>55500 DOT RD</AddressLine1Txt>
            <CityNm>PUEBLO</CityNm>
            <StateAbbreviationCd>CO</StateAbbreviationCd>
            <ZIPCd>810010130</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>TESTING &amp; RESEARCH</ServicesDesc>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>SUBJECT MATTER</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>1201 NEW YORK AV NW SUITE 900</AddressLine1Txt>
            <CityNm>WASHINGTON</CityNm>
            <StateAbbreviationCd>DC</StateAbbreviationCd>
            <ZIPCd>20005</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>PAID MEDIA CONSULTING + ADVERTISING</ServicesDesc>
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      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>GIBSON DUNN &amp; CRUTCHER LLP</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>1050 CONNECTICUT AV NW</AddressLine1Txt>
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            <StateAbbreviationCd>DC</StateAbbreviationCd>
            <ZIPCd>20036</ZIPCd>
          </USAddress>
        </ContractorAddress>
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      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>ARINC</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>2551 RIVA ROAD</AddressLine1Txt>
            <CityNm>ANNAPOLIS</CityNm>
            <StateAbbreviationCd>MD</StateAbbreviationCd>
            <ZIPCd>21401</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>ENGINEERING CONSULTING</ServicesDesc>
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      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>HOGAN LOVELLS US LLP</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>555 13TH ST NW</AddressLine1Txt>
            <CityNm>WASHINGTON</CityNm>
            <StateAbbreviationCd>DC</StateAbbreviationCd>
            <ZIPCd>20004</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>LEGAL CONSULTING</ServicesDesc>
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      <ProgramServiceRevenueGrp>
        <Desc>MEMBERSHIP DUES</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>49276276</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>49276276</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>USER FEES</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>4021372</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>4021372</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>INDUSTRY SUPPORT</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>2398962</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>2398962</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>LICENSING</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>368425</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>368425</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>MEETINGS &amp; CONFERENCES</Desc>
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        <RelatedOrExemptFuncIncomeAmt>94184</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>63492</UnrelatedBusinessRevenueAmt>
      </ProgramServiceRevenueGrp>
      <TotalOthProgramServiceRevGrp>
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        <RelatedOrExemptFuncIncomeAmt>209510</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>769</UnrelatedBusinessRevenueAmt>
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      <RentalIncomeOrLossGrp>
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      <NetRentalIncomeOrLossGrp>
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        <Desc>OTHER REVENUE</Desc>
        <BusinessCd>900099</BusinessCd>
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        <ExclusionAmt>327392</ExclusionAmt>
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      <OtherRevenueMiscGrp>
        <Desc>MEMBERSHIP DIRECTORY A</Desc>
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        <UnrelatedBusinessRevenueAmt>41329</UnrelatedBusinessRevenueAmt>
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      <MiscellaneousRevenueGrp>
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        <Desc>BAD DEBT</Desc>
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      <TotLiabNetAssetsFundBalanceGrp>
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        <EOYAmt>23964746</EOYAmt>
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      <InfoInScheduleOPartXIInd>X</InfoInScheduleOPartXIInd>
      <ReconcilationRevenueExpnssAmt>4923152</ReconcilationRevenueExpnssAmt>
      <NetUnrlzdGainsLossesInvstAmt>-8853</NetUnrlzdGainsLossesInvstAmt>
      <OtherChangesInNetAssetsAmt>3768722</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
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      <FSAuditedBasisGrp>
        <ConsolidatedBasisFinclStmtInd>X</ConsolidatedBasisFinclStmtInd>
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      <AuditCommitteeInd>1</AuditCommitteeInd>
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    </IRS990>
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      <InclEscrowCustodialAcctLiabInd>1</InclEscrowCustodialAcctLiabInd>
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      <LeaseholdImprovementsGrp>
        <OtherCostOrOtherBasisAmt>3130333</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>1564850</DepreciationAmt>
        <BookValueAmt>1565483</BookValueAmt>
      </LeaseholdImprovementsGrp>
      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>1026343</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>831667</DepreciationAmt>
        <BookValueAmt>194676</BookValueAmt>
      </EquipmentGrp>
      <OtherLandBuildingsGrp>
        <OtherCostOrOtherBasisAmt>2402394</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>1583567</DepreciationAmt>
        <BookValueAmt>818827</BookValueAmt>
      </OtherLandBuildingsGrp>
      <TotalBookValueLandBuildingsAmt>2578986</TotalBookValueLandBuildingsAmt>
      <CloselyHeldEquityInterestsGrp>
        <BookValueAmt>8970899</BookValueAmt>
        <MethodValuationCd>C</MethodValuationCd>
      </CloselyHeldEquityInterestsGrp>
      <TotalBookValueSecuritiesAmt>8970899</TotalBookValueSecuritiesAmt>
      <OtherAssetsOrgGrp>
        <Desc>CUSTODIAL FUNDS</Desc>
        <BookValueAmt>804319</BookValueAmt>
      </OtherAssetsOrgGrp>
      <OtherAssetsOrgGrp>
        <Desc>DEFERRED TAX ASSET</Desc>
        <BookValueAmt>31860</BookValueAmt>
      </OtherAssetsOrgGrp>
      <OtherAssetsOrgGrp>
        <Desc>INVESTMENTS RELATED TO SUPP. EMPLOYEE BENEFIT PLANS</Desc>
        <BookValueAmt>1360390</BookValueAmt>
      </OtherAssetsOrgGrp>
      <OtherAssetsOrgGrp>
        <Desc>OTHER POST-EMPLOYMENT BENEFITS</Desc>
        <BookValueAmt>382237</BookValueAmt>
      </OtherAssetsOrgGrp>
      <OtherAssetsOrgGrp>
        <Desc>DUE FROM SUBSIDIARIES</Desc>
        <BookValueAmt>834128</BookValueAmt>
      </OtherAssetsOrgGrp>
      <TotalBookValueOtherAssetsAmt>3412934</TotalBookValueOtherAssetsAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>CURRENT PORTION-OPEB LIABILITY</Desc>
        <Amt>114800</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>ACCRUED PENSION COST</Desc>
        <Amt>22978419</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>DEFERRED COMPENSATION ARRANGEMENT</Desc>
        <Amt>80978</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>DEFERRED RENT PAYABLES</Desc>
        <Amt>3398147</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>CAPITAL LEASE OBLIGATION</Desc>
        <Amt>91127</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>26663471</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART IV, LINE 2B:</FormAndLineReferenceDesc>
        <ExplanationTxt>CUSTODIAL FUNDS ARE CARRIED AS AN ASSET AND AS AN OFFSETTING LIABILITY IN THE ASSOCIATION'S BALANCE SHEET. THE ASSOCIATION ACTS AS CUSTODIAN AND AGENT ON BEHALF OF CERTAIN RAILROAD INDUSTRY RELATED ORGANIZATIONS FOR WHICH THE ASSOCIATION PROVIDES BOOKKEEPING SERVICES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>AAR IS EXEMPT FROM FEDERAL INCOME TAXES UNDER SECTION 501(C)(6) OF THE IRC. HOWEVER, AAR IS SUBJECT TO FEDERAL INCOME TAXES FOR ACTIVITIES THAT ARE UNRELATED TO ITS TAX-EXEMPT FUNCTION. RRF IS INCORPORATED UNDER IRC SECTION 501(C)(3) AS A TAX-EXEMPT ORGANIZATION AND IS FURTHER CLASSIFIED AS A PUBLIC CHARITY UNDER SECTION 509(A)(1) OF THE IRC; HOWEVER, RRF IS SUBJECT TO FEDERAL INCOME TAXES FOR ACTIVITIES THAT ARE UNRELATED TO ITS TAX-EXEMPT FUNCTION. AAR AND RRF, AS TAX-EXEMPT ORGANIZATIONS, FILE SEPARATE INFORMATION RETURNS, FORM 990-RETURN OF ORGANIZATION EXEMPT FROM INCOME TAX, AND TO THE EXTENT OF ANY UNRELATED ACTIVITIES TO THEIR TAX-EXEMPT FUNCTION, FILE FORM 990-T-RETURN OF ORGANIZATION BUSINESS INCOME TAX RETURN. TTCI AND RAILINC FILE SEPARATE FEDERAL AND STATE INCOME TAX RETURNS. ACCORDINGLY, AMOUNTS REPORTED IN THE ACCOMPANYING CONSOLIDATED FINANCIAL STATEMENTS REPRESENT THE COMBINED INCOME TAX ACCOUNTS OF AAR, TTCI, RAILINC AND RRF. DEFERRED TAX ASSETS AND LIABILITIES ARE RECOGNIZED FOR THE FUTURE TAX CONSEQUENCES ATTRIBUTABLE TO DIFFERENCES BETWEEN THE CONSOLIDATED FINANCIAL STATEMENT CARRYING AMOUNTS OF EXISTING ASSETS AND LIABILITIES AND THEIR RESPECTIVE TAX BASES AND OPERATING LOSS AND TAX CREDIT CARRYFORWARDS. DEFERRED TAX ASSETS AND LIABILITIES ARE MEASURED USING ENACTED TAX RATES EXPECTED TO APPLY TO TAXABLE INCOME IN THE YEARS IN WHICH THOSE TEMPORARY DIFFERENCES ARE EXPECTED TO REVERSE. IF APPROPRIATE, DEFERRED TAX ASSETS ARE REDUCED BY A VALUATION ALLOWANCE, WHICH REFLECTS EXPECTATIONS OF THE EXTENT TO WHICH SUCH ASSETS WILL BE REALIZED. THE ASSOCIATION FOLLOWS THE CODIFICATION TOPIC, INCOME TAXES, WHICH ADDRESSES THE DETERMINATION OF WHETHER TAX BENEFITS CLAIMED OR EXPECTED TO BE CLAIMED ON A TAX RETURN SHOULD BE RECORDED IN THE CONSOLIDATED FINANCIAL STATEMENTS. UNDER THIS GUIDANCE, THE ASSOCIATION MAY RECOGNIZE THE TAX BENEFIT FROM AN UNCERTAIN TAX POSITION ONLY IF IT IS MORE LIKELY THAN NOT THAT THE TAX POSITION WILL BE SUSTAINED ON EXAMINATION BY TAXING AUTHORITIES, BASED ON THE TECHNICAL MERITS OF THE POSITION. THE TAX BENEFITS RECOGNIZED IN THE CONSOLIDATED FINANCIAL STATEMENTS FROM SUCH A POSITION ARE MEASURED BASED ON THE LARGEST BENEFIT THAT HAS A GREATER THAN 50% LIKELIHOOD OF BEING REALIZED UPON ULTIMATE SETTLEMENT. THE GUIDANCE ON ACCOUNTING FOR UNCERTAINTY IN INCOME TAXES ALSO ADDRESSES DE-RECOGNITION, CLASSIFICATION, INTEREST AND PENALTIES ON INCOME TAXES AND ACCOUNTING IN INTERIM PERIODS. MANAGEMENT EVALUATED THE ASSOCIATION'S PRECONSOLIDATED TAX POSITIONS AND CONCLUDED THAT THE ASSOCIATION HAS TAKEN NO UNCERTAIN TAX POSITIONS THAT REQUIRE ADJUSTMENT TO THE CONSOLIDATED FINANCIAL STATEMENTS TO COMPLY WITH THE PROVISIONS OF THIS GUIDANCE.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleF documentId="RetDoc1040500001">
      <AccountActivitiesOutsideUSGrp>
        <RegionTxt>NORTH AMERICA</RegionTxt>
        <OfficesCnt>0</OfficesCnt>
        <EmployeeCnt>0</EmployeeCnt>
        <TypeOfActivitiesConductedTxt>PROGRAM SERVICES</TypeOfActivitiesConductedTxt>
        <SpecificServicesProvidedTxt>TRAVEL, MEETING, LODGING, REGISTRATION FEES, SALARY AND FRINGE</SpecificServicesProvidedTxt>
        <RegionTotalExpendituresAmt>102480</RegionTotalExpendituresAmt>
      </AccountActivitiesOutsideUSGrp>
      <AccountActivitiesOutsideUSGrp>
        <RegionTxt>EUROPE (INCLUDING ICELAND &amp; GREENLAND)</RegionTxt>
        <OfficesCnt>0</OfficesCnt>
        <EmployeeCnt>0</EmployeeCnt>
        <TypeOfActivitiesConductedTxt>PROGRAM SERVICES</TypeOfActivitiesConductedTxt>
        <SpecificServicesProvidedTxt>TRAVEL, MEETING, LODGING, REGISTRATION FEES, SALARY AND FRINGE</SpecificServicesProvidedTxt>
        <RegionTotalExpendituresAmt>6353</RegionTotalExpendituresAmt>
      </AccountActivitiesOutsideUSGrp>
      <SubtotalOfficesCnt>0</SubtotalOfficesCnt>
      <SubtotalEmployeesCnt>0</SubtotalEmployeesCnt>
      <ContinuationTotalOfficeCnt>0</ContinuationTotalOfficeCnt>
      <ContinuationTotalEmployeeCnt>0</ContinuationTotalEmployeeCnt>
      <TotalOfficeCnt>0</TotalOfficeCnt>
      <TotalEmployeeCnt>0</TotalEmployeeCnt>
      <SubtotalSpentAmt>108833</SubtotalSpentAmt>
      <ContinuationSpentAmt>0</ContinuationSpentAmt>
      <TotalSpentAmt>108833</TotalSpentAmt>
      <TransferToForeignCorpInd>0</TransferToForeignCorpInd>
      <InterestInForeignTrustInd>0</InterestInForeignTrustInd>
      <ForeignCorpOwnershipInd>0</ForeignCorpOwnershipInd>
      <PassiveForeignInvestmestCoInd>0</PassiveForeignInvestmestCoInd>
      <ForeignPartnershipInd>0</ForeignPartnershipInd>
      <BoycottCountriesInd>0</BoycottCountriesInd>
    </IRS990ScheduleF>
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      <RecipientTable>
        <RecipientBusinessName>
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        </RecipientBusinessName>
        <USAddress>
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          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20001</ZIPCd>
        </USAddress>
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        <IRCSectionDesc>501(C)(6)</IRCSectionDesc>
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        <PurposeOfGrantTxt>PROGRAM SUPPORT</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>AMERICAN CHEMISTRY COUNCIL</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
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          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20002</ZIPCd>
        </USAddress>
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        <IRCSectionDesc>501(C)(6)</IRCSectionDesc>
        <CashGrantAmt>7500</CashGrantAmt>
        <PurposeOfGrantTxt>PROGRAM SUPPORT</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
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        </RecipientBusinessName>
        <USAddress>
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          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20005</ZIPCd>
        </USAddress>
        <RecipientEIN>521403587</RecipientEIN>
        <IRCSectionDesc>501(C)(6)</IRCSectionDesc>
        <CashGrantAmt>25000</CashGrantAmt>
        <PurposeOfGrantTxt>PROGRAM SUPPORT</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>CONGRESSIONAL BLACK CAUCUS POLITCAL EDUCATION AND LEADERSHIP INSTITUTE</BusinessNameLine1Txt>
        </RecipientBusinessName>
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          <AddressLine1Txt>413 NEW JERSEY AVE SE</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20003</ZIPCd>
        </USAddress>
        <RecipientEIN>522270607</RecipientEIN>
        <IRCSectionDesc>501(C)(4)</IRCSectionDesc>
        <CashGrantAmt>20000</CashGrantAmt>
        <PurposeOfGrantTxt>EVENT SUPPORT</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>CONGRESSIONAL BLACK CAUCUS FOUNDATION</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
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          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20036</ZIPCd>
        </USAddress>
        <RecipientEIN>521160561</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>6000</CashGrantAmt>
        <PurposeOfGrantTxt>EVENT SUPPORT</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>CONGRESSIONAL HISPANIC CAUCUS INSTITUTE</BusinessNameLine1Txt>
        </RecipientBusinessName>
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          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20036</ZIPCd>
        </USAddress>
        <RecipientEIN>521114225</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>7500</CashGrantAmt>
        <PurposeOfGrantTxt>EVENT SUPPORT</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>CONGRESSIONAL INSTITUTE INC</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>1700 DIAGONAL ROAD STE 730</AddressLine1Txt>
          <CityNm>ALEXANDRIA</CityNm>
          <StateAbbreviationCd>VA</StateAbbreviationCd>
          <ZIPCd>22314</ZIPCd>
        </USAddress>
        <RecipientEIN>521504189</RecipientEIN>
        <IRCSectionDesc>501(C)(4)</IRCSectionDesc>
        <CashGrantAmt>27500</CashGrantAmt>
        <PurposeOfGrantTxt>PROGRAM SUPPORT</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>COALITION AGAINST BIGGER TRUCKS LLC</BusinessNameLine1Txt>
        </RecipientBusinessName>
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          <CityNm>ALEXANDRIA</CityNm>
          <StateAbbreviationCd>VA</StateAbbreviationCd>
          <ZIPCd>22314</ZIPCd>
        </USAddress>
        <RecipientEIN>943229678</RecipientEIN>
        <IRCSectionDesc>501(C)(4)</IRCSectionDesc>
        <CashGrantAmt>470000</CashGrantAmt>
        <PurposeOfGrantTxt>PROGRAM SUPPORT</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>EDISON ELECTRIC INSTITUTE</BusinessNameLine1Txt>
        </RecipientBusinessName>
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          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20004</ZIPCd>
        </USAddress>
        <RecipientEIN>130659550</RecipientEIN>
        <IRCSectionDesc>501(C)(6)</IRCSectionDesc>
        <CashGrantAmt>6500</CashGrantAmt>
        <PurposeOfGrantTxt>PROGRAM SUPPORT</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
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        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>GEORGETOWN U CTR FOR BUS PUB</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20057</ZIPCd>
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        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>160000</CashGrantAmt>
        <PurposeOfGrantTxt>PROGRAM SUPPORT</PurposeOfGrantTxt>
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      <RecipientTable>
        <RecipientBusinessName>
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        </RecipientBusinessName>
        <USAddress>
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          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20024</ZIPCd>
        </USAddress>
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        <PurposeOfGrantTxt>PROGRAM SUPPORT</PurposeOfGrantTxt>
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      <RecipientTable>
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          <BusinessNameLine1Txt>JOHN W BARRIGER III NATIONAL RAILROAD LIBRARY</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>ONE UNIVERSITY BLVD</AddressLine1Txt>
          <CityNm>ST LOUIS</CityNm>
          <StateAbbreviationCd>MO</StateAbbreviationCd>
          <ZIPCd>631214499</ZIPCd>
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        <RecipientEIN>570976265</RecipientEIN>
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        <PurposeOfGrantTxt>PROGRAM SUPPORT</PurposeOfGrantTxt>
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      <RecipientTable>
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        </RecipientBusinessName>
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        <PurposeOfGrantTxt>PROGRAM SUPPORT</PurposeOfGrantTxt>
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      <RecipientTable>
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        </RecipientBusinessName>
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          <StateAbbreviationCd>NJ</StateAbbreviationCd>
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      <RecipientTable>
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          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20002</ZIPCd>
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        <PurposeOfGrantTxt>PROGRAM SUPPORT</PurposeOfGrantTxt>
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      <RecipientTable>
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          <CityNm>URBANA</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
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        <PurposeOfGrantTxt>PROGRAM SUPPORT</PurposeOfGrantTxt>
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      <RecipientTable>
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          <StateAbbreviationCd>VA</StateAbbreviationCd>
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      <Total501c3OrgCnt>9</Total501c3OrgCnt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>AAR AWARDS ASSISTANCE TO ORGANIZATIONS RECOGNIZED AS TAX-EXEMPT UNDER IRC SECTION 501(C) OR AS A COLLEGE OR UNIVERSITY.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleI>
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        <PersonNm>MICHAEL J RUSH</PersonNm>
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        <PersonNm>JEFFREY D MARSH</PersonNm>
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        <PersonNm>PATRICIA M REILLY</PersonNm>
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        <PersonNm>JOHN T GRAY</PersonNm>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>KATHY D KIRMAYER</PersonNm>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>IAN N JEFFERIES</PersonNm>
        <TitleTxt>SVP-GOVERNMENT AFFAIRS</TitleTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>JOHN F WETZEL</PersonNm>
        <TitleTxt>VP-GOVERNMENT AFFAIRS</TitleTxt>
        <BaseCompensationFilingOrgAmt>96173</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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        <OtherCompensationFilingOrgAmt>1545</OtherCompensationFilingOrgAmt>
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        <DeferredCompensationFlngOrgAmt>55772</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>2420</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>155910</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>JANET L BARTELMAY</PersonNm>
        <TitleTxt>CORPORATE SECRETARY</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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        <DeferredCompensationFlngOrgAmt>84178</DeferredCompensationFlngOrgAmt>
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        <NontaxableBenefitsFilingOrgAmt>18058</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>389948</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
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      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>WILLIAM C THOMPSON</PersonNm>
        <TitleTxt>PROGRAM MANAGER</TitleTxt>
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      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DANIEL SAPHIRE</PersonNm>
        <TitleTxt>ASSOCIATE GENERAL COUNSEL</TitleTxt>
        <BaseCompensationFilingOrgAmt>212473</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>KELLEY FRENCH DONLEY</PersonNm>
        <TitleTxt>AVP-MEMBER SERVICES</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>ROBERT E FRONCZAK</PersonNm>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>TIMONTHY J STRAFFORD</PersonNm>
        <TitleTxt>ASSOCIATE GENERAL COUNSEL</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 1A</FormAndLineReferenceDesc>
        <ExplanationTxt>TRAVEL FOR COMPANIONS: EDWARD R. HAMBERGER RECEIVED A NON-TAXABLE SPOUSAL TRAVEL DUE TO ACTIVE PARTICIPATION IN BUSINESS EVENT. SERPS PAID OUT IN 2017 INCLUDED A TAX GROSS UP FACTOR. HOUSING ALLOWANCE: WILLIAM C. THOMPSON - $14,237 - TAXABLE NONTAXABLE SOCIAL CLUB DUES: EDWARD R. HAMBERGER - $13,510 IAN JEFFRIES - $8,452</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 4B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FOLLOWING INDIVIDUAL PARTICIPATES IN A NON-QUALIFIED DERERRED COMPENSATION ARRANGEMENT. KATHY D. KIRMAYER - $35,000 THE FOLLOWING EXECUTIVES PARTICIPATE IN RETENTION AND STAY AGREEMENTS: EDWARD R. HAMBERGER - $1,130,474 MICHAEL J. RUSH - $66,657 JEFFREY D. MARSH - $96,494 THE FOLLOWING INDIVIDUALS RECEIVED PAYMENT FROM SERP: EDWARD R. HAMBERGER - $5,356,986 JEFFREY D. MARSH - $615,324 PATRICIA M. REILLY - $372,275</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>EDWARD HAMBERGER, JANET BARTELMAY AND KATHRYN KIRMAYER - BUSINESS RELATIONSHIP</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>ORGANIZATION'S MEMBERS AAR MEMBERS INCLUDE THE MAJOR FREIGHT RAILROADS OF THE UNITED STATES, CANADA AND MEXICO, AS WELL AS SMALLER RAILROADS THAT PROVIDE FREIGHT OR PASSENGER SERVICES THROUGHOUT NORTH AMERICA. IN ADDITION, NATIONAL RAILROAD PASSENGER CORP. (AMTRAK) IS A FULL MEMBER OF AAR. AAR'S FULL MEMBERS HAVE VOTING RIGHTS AS PRESCRIBED IN THE AAR BY-LAWS. AAR HAS THREE CLASSES OF MEMBERSHIP: (1) FULL MEMBERSHIP IS AVAILABLE TO U.S. RAILROADS, (2) SPECIAL MEMBERSHIP IS AVAILABLE TO CANADIAN AND MEXICAN RAILROADS, AND (3) ASSOCIATE MEMBERSHIP IS AVAILABLE TO NON-CLASS 1 RAILROADS AND RAILROAD SUPPLIERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>AAR CORPORATE DOCUMENTS ALLOW FOR DECISIONS TO BE APPROVED BY MEMBERS TO THE EXTENT PROVIDED BY LAW. ALL MATTERS ARE SUBJECT TO APPROVAL IN ACCORDANCE WITH STATE/LOCAL LAW.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 IS REVIEWED IN DETAIL BY PRESIDENT AND GENERAL COUNSEL PRIOR TO FILING. THEN A COPY OF THE RETURN IS PROVIDED TO EACH MEMBER OF CURRENT GOVERNING BODY - VIA SECURE ONLINE LINK TO PDF DOCUMENT. THE DIRECTORS ARE GIVEN AN OPPORTUNITY TO REVIEW, DISCUSS, AND ASK QUESTIONS BEFORE THE RETURN IS FILED WITH THE IRS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>AN ANNUAL WRITTEN CONFIRMATION OF COMPLIANCE WITH THE ORGANIZATION'S CONFLICT OF INTEREST POLICIES IS REQUIRED FROM ALL AAR EMPLOYEES AND DIRECTORS. THE ANNUAL CONFLICT OF INTEREST DISCLOSURES OF EMPLOYEES ARE REVIEWED BY THE DIRECTOR OF HUMAN RESOURCES OR GENERAL COUNSEL. THE DISCLOSURES OF THE OFFICERS,INCLUDING PRESIDENT, AND CEO, ARE REPORTED TO THE GENERAL COUNSEL. DISCLOSURES OF THE GENERAL COUNSEL ARE REPORTED TO THE CEO. IN THE EVENT OF AN ACTUAL OR POTENTIAL CONFLICT, AAR WOULD INVESTIGATE AND TAKE APPROPRIATE ACTION TO AVOID AN ACTUAL OR POTENTIAL CONFLICT. SUCH ACTION WOULD INCLUDE THAT THE CONFLICTED PERSON DOES NOT PARTICIPATE IN THE REVIEW, RESOLUTION PROCESS, OR ANY DELIBERATION/DECISION MAKING RELATED TO THE MATTER. FOLLOW UP ACTIONS ARE TAKEN AS NEEDED BY AAR GENERAL COUNSEL OR THE CEO.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>COMPARABILITY DATA IS PREPARED BY AN INDEPENDENT COMPENSATION CONSULTANT FOR EXECUTIVE (CEO AND VICE PRESIDENTS) COMPENSATION. THAT INFORMATION IS PROVIDED ANNUALLY TO THE ORGANIZATION'S GOVERNANCE COMMITTEE AS PART OF ITS ANNUAL BUDGET DELIBERATIONS. EXECUTIVE SALARIES ARE REVIEWED AND ANY MERIT ADJUSTMENTS FOR THAT FISCAL YEAR ARE DETERMINED AS PART OF THE ANNUAL BUDGETARY PROCESS. CONTEMPORANEOUS MINUTES OF GOVERNANCE COMMITTEE MEETINGS ARE MAINTAINED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION MAKES ITS GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS AVAILABLE TO THE PUBLIC TO THE EXTENT REQUIRED BY LAW.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>UNRECOGNIZED CHANGE, DEFINED BENEFIT PLAN OBLIGATIONS 3,768,722.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
    <IRS990ScheduleR documentId="RetDoc1043400001">
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        <DisregardedEntityName>
          <BusinessNameLine1Txt>RAILROAD RESEARCH FOUNDATION</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>425 THIRD ST SW SUITE 910</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20024</ZIPCd>
        </USAddress>
        <EIN>522344655</EIN>
        <PrimaryActivitiesTxt>RESEARCH</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DE</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>LINE 7</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>ASSOCIATION OF AMERICAN RAILROADS</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>1</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>RAILPAC</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>425 THIRD ST SW SUITE 1000</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20024</ZIPCd>
        </USAddress>
        <EIN>521811074</EIN>
        <PrimaryActivitiesTxt>POLITICAL ACTIVITIES</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DC</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>527</ExemptCodeSectionTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>ASSOCIATION OF AMERICAN RAILROADS</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>1</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
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          <BusinessNameLine1Txt>AAR RETIREE LIFE INSURANCE TRUST</BusinessNameLine1Txt>
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          <AddressLine1Txt>425 THIRD ST SW SUITE 1000</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20024</ZIPCd>
        </USAddress>
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        <LegalDomicileStateCd>DC</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(C)(9)</ExemptCodeSectionTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>ASSOCIATION OF AMERICAN RAILROADS</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>1</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>TRANSPORTATION TECHNOLOGY CENTER INC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>55500 DOT ROAD</AddressLine1Txt>
          <CityNm>PUEBLO</CityNm>
          <StateAbbreviationCd>CO</StateAbbreviationCd>
          <ZIPCd>81001</ZIPCd>
        </USAddress>
        <EIN>841440384</EIN>
        <PrimaryActivitiesTxt>RESEARCH &amp; TESTING</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DE</LegalDomicileStateCd>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>ASSOCIATION OF AMERICAN RAILROADS</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <EntityTypeTxt>C</EntityTypeTxt>
        <ShareOfTotalIncomeAmt>33386191</ShareOfTotalIncomeAmt>
        <ShareOfEOYAssetsAmt>33712121</ShareOfEOYAssetsAmt>
        <OwnershipPct>1.00000</OwnershipPct>
        <ControlledOrganizationInd>1</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>RAILINC CORPORATION</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>7001 WESTON PARKWAY SUITE 200</AddressLine1Txt>
          <CityNm>CARY</CityNm>
          <StateAbbreviationCd>NC</StateAbbreviationCd>
          <ZIPCd>27513</ZIPCd>
        </USAddress>
        <EIN>522131600</EIN>
        <PrimaryActivitiesTxt>IT &amp; SVCS</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DE</LegalDomicileStateCd>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>ASSOCIATION OF AMERICAN RAILROADS</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <EntityTypeTxt>C</EntityTypeTxt>
        <ShareOfTotalIncomeAmt>67076824</ShareOfTotalIncomeAmt>
        <ShareOfEOYAssetsAmt>36810704</ShareOfEOYAssetsAmt>
        <OwnershipPct>1.00000</OwnershipPct>
        <ControlledOrganizationInd>1</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <ReceiptOfIntAnntsRntsRyltsInd>0</ReceiptOfIntAnntsRntsRyltsInd>
      <GiftGrntOrCapContriToOthOrgInd>0</GiftGrntOrCapContriToOthOrgInd>
      <GiftGrntCapContriFromOthOrgInd>0</GiftGrntCapContriFromOthOrgInd>
      <LoansOrGuaranteesToOtherOrgInd>1</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>1</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>0</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>0</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>0</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>0</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>1</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>1</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>1</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>1</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>1</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>1</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>0</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>1</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>1</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>1</TransferFromOtherOrgInd>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>RAILINC CORPORATION</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>L</TransactionTypeTxt>
        <InvolvedAmt>1588153</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>COST</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>RAILINC CORPORATION</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>M</TransactionTypeTxt>
        <InvolvedAmt>359410</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>COST</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>RAILINC CORPORATION</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>Q</TransactionTypeTxt>
        <InvolvedAmt>395483</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>COST</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>RAILINC CORPORATION</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>S</TransactionTypeTxt>
        <InvolvedAmt>4144490</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>COST</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>TRANSPORTATION TECHNOLOGY CENTER INC</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>L</TransactionTypeTxt>
        <InvolvedAmt>942102</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>COST</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>TRANSPORTATION TECHNOLOGY CENTER INC</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>M</TransactionTypeTxt>
        <InvolvedAmt>13194854</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>COST</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>TRANSPORTATION TECHNOLOGY CENTER INC</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>Q</TransactionTypeTxt>
        <InvolvedAmt>1102149</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>COST</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>RAILPAC</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>R</TransactionTypeTxt>
        <InvolvedAmt>59630</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>COST</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART V</FormAndLineReferenceDesc>
        <ExplanationTxt>THE TRANSACTION CORRESPONDING WITH LINES 1D AND 1E INVOLVES AN UNSECURED LINE OF CREDIT WHICH WAS CO-SIGNED BY ORGANIZATIONS RELATED TO THE ASSOCIATION OF AMERICAN RAILROADS. THE $4 MILLION UNSECURED LINE OF CREDIT HAD AN ORIGINAL EXPIRATION DATE OF JULY 31, 2008 AND THE AGREEMENT WAS SUBSEQUENTLY RENEWED MOST RECENTLY DURING 2017, WITH A MATURITY DATE OF AUGUST 31, 2018. UNDER THE LINE OF CREDIT FACILITY, SUNTRUST BANK WILL ALLOW ADVANCES AT ANY TIME PROVIDED NO SIGNIFICANT DETERIORATION IN THE FINANCIAL CONDITION OF THE CO-BORROWERS HAS OCCURRED. AS OF DECEMBER 31, 2017, NO AMOUNTS HAD BEEN WITHDRAWN ON THE LINE OF CREDIT.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleR>
  </ReturnData>
</Return>