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Derivatives ( Schedule of notional amounts of outstanding foreign currency derivatives (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Derivative Instruments Designated as Hedges [Member]
Foreign Currency Fair Value Hedge Derivative [Line Items]
Notional Amount	$ 8,780	$ 11,562

X

- Definition

Carrying amount as of the balance sheet date of the asset arising from derivative instruments and hedging activities, which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(8))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_DerivativeInstrumentsAndHedges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=rail_DerivativeInstrumentsDesignatedAsHedgesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: