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Debt Financing and Revolving Credit Facilities (Fair Value of Warrant) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Debt Disclosure [Abstract]
Warrant liability	$ 31,028
Warrant issued	3,544
Change in fair value	1,869
Warrant liability	$ 36,441

X

- Definition

Change in fair value

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

Value of preferred stock and warrants for common stock issued.

+ References

No definition available.

+ Details

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

X

- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

+ References

No definition available.

+ Details

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