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Subsequent Event (Details) - Subsequent Event [Member] $ in Thousands	Feb. 21, 2020 USD ($)
Subsequent Event [Line Items]
Increase in borrowing capacity as percentage of qualified unrestriced cash	100.00%
Increase in borrowing capacity	$ 4,000

X

- Definition

Line of Credit Facility, Increase in borrowing capacity

+ References

No definition available.

+ Details

Name:	rail_LineOfCreditFacilityIncreaseInBorrowingCapacity
Namespace Prefix:	rail_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line of Credit Facility, Increase in borrowing capacity as percentage of qualified unrestriced cash

+ References

No definition available.

+ Details

Name:	rail_LineOfCreditFacilityIncreaseInBorrowingCapacityAsPercentageOfQualifiedUnrestricedCash
Namespace Prefix:	rail_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: