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Contingencies (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Dec. 31, 2015 | Mar. 31, 2018
Contingencies [Abstract] |  |  |
State and local incentives received | $ 1,410 | $ 15,733 |
Deferred liability balance |  |  | $ 10,825

X
- Definition Deferred income from government grants as of the balance sheet date. This liability represents the portion of government grants received which has not yet been recognized in the income statement. + References No definition available. + Details
Name: | rail_DeferredIncomeGovernmentGrants
Namespace Prefix: | rail_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The cash inflow during the period from government grants received. + References No definition available. + Details
Name: | rail_ProceedsFromGovernmentGrantsReceived
Namespace Prefix: | rail_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration