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  <xs:element id="fstr_ContractWithCustomerLiabilityOtherAdjustments" abstract="false" name="ContractWithCustomerLiabilityOtherAdjustments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fstr_NumberOfManufacturingFacilities" abstract="false" name="NumberOfManufacturingFacilities" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="fstr_LineOfCreditAccordionFeatureLowerBorrowingCapacityOption" abstract="false" name="LineOfCreditAccordionFeatureLowerBorrowingCapacityOption" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fstr_StockRepurchaseProgramAuthorizedAmountAnnualLimitation" abstract="false" name="StockRepurchaseProgramAuthorizedAmountAnnualLimitation" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fstr_DeferredTaxAssetsOperatingLossAndTaxCreditCarryforwards" abstract="false" name="DeferredTaxAssetsOperatingLossAndTaxCreditCarryforwards" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fstr_RailProductsMember" abstract="true" name="RailProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="fstr_LesseeBalanceSheetLocationsTableTextBlock" abstract="false" name="LesseeBalanceSheetLocationsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="fstr_ContractWithCustomerLiabilityIncreaseFromCashReceipts" abstract="false" name="ContractWithCustomerLiabilityIncreaseFromCashReceipts" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fstr_GoodwillImpairmentPercentage" abstract="false" name="GoodwillImpairmentPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="fstr_PilingProductsMember" abstract="true" name="PilingProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="fstr_Swap2Member" abstract="true" name="Swap2Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="fstr_EffectiveIncomeTaxRateReconciliationUnremittedForeignEarningsPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationUnremittedForeignEarningsPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="fstr_BusinessCombinationPaymentOfDeferredConsiderationTerm" abstract="false" name="BusinessCombinationPaymentOfDeferredConsiderationTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="fstr_NumberOfCompaniesReceivingGeneralNoticeLetter" abstract="false" name="NumberOfCompaniesReceivingGeneralNoticeLetter" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="fstr_UndiscoveredRemedialWork" abstract="false" name="UndiscoveredRemedialWork" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fstr_LitigationSettlementAmountAwardedToOtherPartyCurrent" abstract="false" name="LitigationSettlementAmountAwardedToOtherPartyCurrent" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
