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

X

- 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

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