49 U.S.C. § 24306

(a) Actions To Increase Revenues .— Amtrak shall take necessary action to increase its revenues from the transportation of mail and express. To increase its revenues, Amtrak may provide auto-ferry transportation as part of the basic passenger transportation authorized by this part. (b) Authority of Others To Provide Auto-Ferry Transportation .— State and local laws and regulations that impair the provision of auto-ferry transportation do not apply to Amtrak or a rail carrier providing auto-ferry transportation. A rail carrier may not refuse to participate with Amtrak in providing auto-ferry transportation because a State or local law or regulation makes the transportation unlawful.