Percentage Of Warrant To Purchase Outstanding Common Stock

No definition available.

Name:	rail_PercentageOfWarrantToPurchaseOutstandingCommonStock
Namespace Prefix:	rail_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Preferred Stock Initial Stated Value

+ References

No definition available.

+ Details

Name:	rail_PreferredStockInitialStatedValue
Namespace Prefix:	rail_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of increase (decrease) 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_LineOfCreditFacilityIncreaseDecreaseForPeriodNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644

+ Details

Name:	us-gaap_PreferredStockParOrStatedValuePerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

+ References

+ Details

Name:	us-gaap_PreferredStockSharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- 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

- Details

Name:	us-gaap_DebtInstrumentAxis=rail_SienaLoanAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=rail_SecuritiesPurchaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=rail_NonConvertibleSeriesCPreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent Events (Additional Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	Mar. 23, 2023	Feb. 27, 2023	Jan. 31, 2023	Dec. 31, 2022	Feb. 23, 2022	Dec. 31, 2021	Jul. 30, 2021	Oct. 08, 2020
Subsequent Event [Line Items]
Preferred Stock, Par or Stated Value Per Share				$ 0.01		$ 0.01
Siena Loan Agreement [Member]
Subsequent Event [Line Items]
Maximum borrowing capacity					$ 35,000		$ 25,000	$ 20,000
Subsequent Event [Member] \| Siena Loan Agreement [Member]
Subsequent Event [Line Items]
Maximum borrowing capacity		$ 15,000	$ 15,000
Subsequent Event [Member] \| Securities Purchase Agreement [Member]
Subsequent Event [Line Items]
Reduction of the letter of credit fee paid per quarter	$ 375
Subsequent Event [Member] \| Non Convertible Series C Preferred Stock [Member] \| Securities Purchase Agreement [Member]
Subsequent Event [Line Items]
Preferred Stock, Shares Issued	85,000
Preferred Stock, Par or Stated Value Per Share	$ 0.01
Preferred stock initial stated value	$ 1,000
Percentage of warrant to purchase outstanding common stock	3.00%