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Revenue Recognition (Narrative) (Details)	3 Months Ended
	Mar. 31, 2018
Revenue Recognition [Abstract]
Warranty Term	5 years

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- Definition

Warranty Term

+ References

No definition available.

+ Details

Name:	rail_WarrantyTerm
Namespace Prefix:	rail_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration