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v3.19.3.a.u2

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

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- 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

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- 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

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- 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

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