Section 81.04.540 - Regulation of common carriers, railroad safety practices(1) The commission shall cooperate with the federal government and the United States department of transportation, or its successor, or any other commission or agency delegated or authorized to regulate interstate or foreign commerce by common carriers, to the end that the transportation of property and passengers by common carriers in interstate or foreign commerce into and through the state of Washington may be regulated and that the laws of the United States and the state of Washington are enforced and administered cooperatively in the public interest.(2) In addition to its authority concerning interstate commerce under this title, the commission may regulate common carriers in interstate commerce within the state under the authority of and in accordance with any act of congress that vests in or delegates to the commission such authority as an agency of the United States government or under an agreement with the United States department of transportation, or its successor, or any other commission or agency delegated or authorized to regulate interstate or foreign commerce by common carriers.(3) For the purpose of participating with the United States department of transportation in investigation and inspection activities necessary to enforce federal railroad safety regulations, the commission has regulatory jurisdiction over the safety practices for railroad equipment, facilities, rolling stock, and operations in the state.