Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 160, § 163A

Every railroad corporation shall equip each of the track motor cars operated by it with a windshield and a device for cleaning such windshield, which device shall be maintained in good order and shall be so constructed as to be controlled and operated by the operator of said track motor car; and a canopy or top of such construction as to adequately protect the occupants of such cars from rain, snow and inclement weather.

It shall be unlawful for any railroad corporation to operate any track motor car unless it is equipped with a windshield and canopy or top as provided in this section.