XML 47 R37.htm IDEA: XBRL DOCUMENT v3.10.0.1

Revenue Recognition (Narrative) (Details)	6 Months Ended
	Jun. 30, 2018
Revenue Recognition [Abstract]
Warranty Term	5 years

X

- Definition

Warranty Term

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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