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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2015
Fair Value Measurements [Abstract]
Purchase price in escrow	$ 980	$ 980	$ 1,960

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- Definition

Amount of aggregate purchase prices related to the disposal of an asset or business unit in order to secure indemnification obligations.

+ References

No definition available.

+ Details

Name:	rail_PurchasePriceInEscrow
Namespace Prefix:	rail_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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