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Subsequent Event (Narrative) (Details) - Subsequent Event - USD ($) $ in Millions		3 Months Ended
	Jul. 19, 2022	Sep. 30, 2022
Subsequent Event [Line Items]
Line of credit facility, increase amount	$ 27.6
Percentage of Future benefit obligations	67.70%
Non cash pre tax pension settlement charge		$ 8.1

X

- Definition

Non cash pre tax pension settlement charge

+ References

No definition available.

+ Details

Name:	rail_NonCashPreTaxPensionSettlementCharge
Namespace Prefix:	rail_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of Future benefit obligations

+ References

No definition available.

+ Details

Name:	rail_PercentageOfFutureBenefitObligations
Namespace Prefix:	rail_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of increase (decrease), classified as other, of the credit facility.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

+ Details

Name:	us-gaap_LineOfCreditFacilityIncreaseDecreaseOtherNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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: