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        <link:definition>2439402 - Disclosure - Guarantor Subsidiaries Financial Information - Balance Sheet (Details)</link:definition>
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        <link:definition>2439404 - Disclosure - Guarantor Subsidiaries Financial Information - Cash Flows (Details)</link:definition>
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        <link:definition>2439403 - Disclosure - Guarantor Subsidiaries Financial Information - Income Statement (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType id="GuarantorSubsidiariesFinancialInformationTables" roleURI="http://www.wabtec.com/role/GuarantorSubsidiariesFinancialInformationTables">
        <link:definition>2339301 - Disclosure - Guarantor Subsidiaries Financial Information (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>2125100 - Disclosure - Income Taxes</link:definition>
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        <link:definition>2425401 - Disclosure - Income Taxes (Detail)</link:definition>
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        <link:definition>2111100 - Disclosure - Intangibles</link:definition>
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        <link:definition>2411403 - Disclosure - Intangibles - Additional Information (Detail)</link:definition>
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        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:definition>2411402 - Disclosure - Intangibles - Change in the Carrying Amount of Goodwill by Segment (Detail)</link:definition>
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        <link:definition>2411404 - Disclosure - Intangibles - Intangible Assets Other Than Goodwill and Trade Names (Detail)</link:definition>
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        <link:definition>2311301 - Disclosure - Intangibles (Tables)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType id="Inventories" roleURI="http://www.wabtec.com/role/Inventories">
        <link:definition>2106100 - Disclosure - Inventories</link:definition>
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      <link:roleType id="InventoriesDetails" roleURI="http://www.wabtec.com/role/InventoriesDetails">
        <link:definition>2406402 - Disclosure - Inventories (Details)</link:definition>
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      <link:roleType id="InventoriesTables" roleURI="http://www.wabtec.com/role/InventoriesTables">
        <link:definition>2306301 - Disclosure - Inventories (Tables)</link:definition>
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      <link:roleType id="Leases" roleURI="http://www.wabtec.com/role/Leases">
        <link:definition>2117100 - Disclosure - Leases</link:definition>
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        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType id="LeasesLeaseExpenseDetails" roleURI="http://www.wabtec.com/role/LeasesLeaseExpenseDetails">
        <link:definition>2417402 - Disclosure - Leases - Lease Expense (Details)</link:definition>
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      <link:roleType id="LeasesLeaseTermAndDiscountRateDetails" roleURI="http://www.wabtec.com/role/LeasesLeaseTermAndDiscountRateDetails">
        <link:definition>2417404 - Disclosure - Leases - Lease Term and Discount Rate (Details)</link:definition>
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        <link:definition>2417403 - Disclosure - Leases - Maturity of Lease Liabilities (Details)</link:definition>
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      <link:roleType id="LeasesMaturityOfLeaseLiabilitiesDetailsCalc2" roleURI="http://www.wabtec.com/role/LeasesMaturityOfLeaseLiabilitiesDetailsCalc2">
        <link:definition>2417403 - Disclosure - Leases - Maturity of Lease Liabilities (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType id="LeasesMaturityOfLeaseLiabilitiesDetailsCalc3" roleURI="http://www.wabtec.com/role/LeasesMaturityOfLeaseLiabilitiesDetailsCalc3">
        <link:definition>2417403 - Disclosure - Leases - Maturity of Lease Liabilities (Details)</link:definition>
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        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType id="LeasesNarrativeDetails" roleURI="http://www.wabtec.com/role/LeasesNarrativeDetails">
        <link:definition>2417405 - Disclosure - Leases - Narrative (Details)</link:definition>
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      <link:roleType id="LeasesTables" roleURI="http://www.wabtec.com/role/LeasesTables">
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      <link:roleType id="LongTermDebt" roleURI="http://www.wabtec.com/role/LongTermDebt">
        <link:definition>2118100 - Disclosure - Long-Term Debt</link:definition>
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      <link:roleType id="LongTermDebtScheduleOfLongTermDebtDetails" roleURI="http://www.wabtec.com/role/LongTermDebtScheduleOfLongTermDebtDetails">
        <link:definition>2418402 - Disclosure - Long-Term Debt - Schedule of Long-term Debt (Details)</link:definition>
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        <link:definition>2338301 - Disclosure - Segment Information (Tables)</link:definition>
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        <link:definition>2424404 - Disclosure - Stock-Based Compensation - Fair Value of Each Option Grant Weighted Average Assumptions (Detail)</link:definition>
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        <link:definition>2424405 - Disclosure - Stock-Based Compensation - Restricted Stock Activity and Incentive Stock Awards Activity (Detail)</link:definition>
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        <link:definition>2424403 - Disclosure - Stock-Based Compensation - Stock Option Activity (Detail)</link:definition>
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        <link:definition>2324301 - Disclosure - Stock-Based Compensation (Tables)</link:definition>
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        <link:definition>2127100 - Disclosure - Warranties</link:definition>
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        <link:definition>2427402 - Disclosure - Warranties (Detail)</link:definition>
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        <link:definition>2327301 - Disclosure - Warranties (Tables)</link:definition>
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  <xsd:element abstract="true" id="wab_A4.375PercentSeniorNotesDueTwentyThousandandTwentyThreeMember" name="A4.375PercentSeniorNotesDueTwentyThousandandTwentyThreeMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="wab_A4.70PercentSeniorNotesDueTwentyThousandandTwentySixMember" name="A4.70PercentSeniorNotesDueTwentyThousandandTwentySixMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="wab_A4.75PercentSeniorNotesDueTwoThousandTwentyThreeMember" name="A4.75PercentSeniorNotesDueTwoThousandTwentyThreeMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
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  <xsd:element abstract="true" id="wab_WabtecMember" name="WabtecMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="wab_WeightedaverageDiscountRateAbstract" name="WeightedaverageDiscountRateAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
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</xsd:schema>
