Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 159, § 103

Whoever unlawfully and intentionally injures, molests or destroys any signal of a railroad corporation or railway company, or any line, wire, post or other structure or mechanism used in connection with such signal, or prevents or in any way interferes with the proper working of such signal, or whoever unlawfully and intentionally injures, molests, meddles or tampers with or destroys a track, car, motor bus or trackless trolley vehicle or any part, appliance or appurtenance thereof, of a railroad corporation or railway company, or the mechanism or apparatus used in the operation of any such car, motor bus or trackless trolley vehicle, or whoever without right operates any such car, motor bus or trackless trolley vehicle or any mechanism or appliance thereof, shall be punished by a fine of not more than five hundred dollars or by imprisonment for not more than two years, or both.