Suits as authorized by this chapter may be brought only within two years after the cause of action arises: Provided, That where a remedy is provided by this chapter it shall hereafter be exclusive of any other action by reason of the same subject matter against the agent or employee of the United States or of any incorporated or unincorporated agency thereof whose act or omission gave rise to the claim: Provided further, That the limitations contained in this section for the commencement of suits shall not bar any suit against the United States brought hereunder within one year after December 13, 1950, if such suit is based upon a cause of action whereon a prior suit in admiralty or an action at law was timely commenced and was or may hereafter be dismissed solely because improperly brought against any person, partnership, association, or corporation engaged by the United States to manage and conduct the business of a vessel owned or bareboat chartered by the United States or against the master of any such vessel: And provided further, That after June 30, 1932, no interest shall be allowed on any claim prior to the time when suit on such claim is brought as authorized by section
742 of this Appendix unless upon a contract expressly stipulating for the payment of interest.