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State and Local Incentives (Changes in Deferred Income from State Incentives) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
State and Local Incentives [Abstract]
Balance at the beginning of the year	$ 6,941	$ 9,160
Recognition of state and local incentives as a reduction of cost of sales	(2,219)	(2,219)
Balance at the end of the year, including current portion	$ 4,722	$ 6,941

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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 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