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State and Local Incentives (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2020 | Dec. 31, 2015
State and Local Incentives [Abstract] |  |  |
State incentives received during the year | $ 1,410 |  | $ 15,733
Incentive Agreement, Term |  | 6 years |

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- Definition Amount of deferred income recognized for government grants arising during the current reporting period.Deferred income government grants is a liability as of the balance sheet date. + References No definition available. + Details
Name: | rail_DeferredIncomeGovernmentGrantsAdditions
Namespace Prefix: | rail_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Incentive Agreement, Term + References No definition available. + Details
Name: | rail_IncentiveAgreementTerm
Namespace Prefix: | rail_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition State and Local Incentives [Abstract] + References No definition available. + Details
Name: | rail_StateAndLocalIncentivesAbstract
Namespace Prefix: | rail_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration