§ 134. Duties of commissioner as to interstate traffic. The commissioner may investigate interstate freight or passenger rates or interstate freight or passenger service on railroads within the state, and when such rates are, in the opinion of the commissioner, excessive or discriminatory or are levied or laid in violation of the act of congress entitled "An act to regulate commerce," approved February fourth, eighteen hundred and eighty-seven, and the acts amendatory thereof and supplementary thereto, or in conflict with the rulings, orders or regulations of the United States department of transportation, the commissioner may apply by petition to the United States department of transportation for relief or may present to the United States department of transportation all facts coming to his knowledge, as to violations of the rulings, orders, or regulations of that commission or as to violations of the said act to regulate commerce or acts amendatory thereof or supplementary thereto.