Section 244.21 - Compliance and Enforcement(a) After the Surface Transportation Board has approved a transaction subject to this part, a railroad implementing a transaction subject to this part shall operate in accordance with the Safety Implementation Plan approved by FRA until the properties involved in the transaction are completely integrated into the form contemplated in the Surface Transportation Board's approval of the transaction.(b) FRA may exercise any or all of its enforcement remedies authorized by the Federal railroad safety laws if a railroad fails to comply with paragraph (a) of this section or to execute any measure contained in a Safety Implementation Plan approved by FRA.