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State and Local Incentives (Changes in Deferred Income from State Incentives) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
State and Local Incentives [Abstract] |  |  |
Balance at the beginning of the period | $ 13,599 | $ 14,318 |
State and local incentives received during the year |  | 1,410 | $ 15,733
Recognition of state and local incentives as a reduction of cost of sales | (2,219) | (2,129) | (1,415)
Balance at the end of the year, including current portion | $ 11,380 | $ 13,599 | $ 14,318

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- 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

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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 Amount of previously recorded deferred income from government grants that was recognized in the income statement during the period. + References No definition available. + Details
Name: | rail_RecognitionOfDeferredIncomeFromStateAndLocalIncentives
Namespace Prefix: | rail_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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