Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 159, § 104

Whoever wilfully throws or shoots a missile at a locomotive engine, or railroad or railway car or train, or at a motor bus or trackless trolley vehicle, or at a school bus, or at a person on such engine, car, train, motor bus or trackless trolley vehicle, or school bus, or in any way assaults or interferes with a conductor, engineer, brakeman, motorman or operator while in the performance of his duty on or near such engine, car, train, motor bus or trackless trolley vehicle, or school bus, shall be punished by a fine of not more than five hundred dollars or by imprisonment for not more than one year, or both. A person so offending may be arrested without a warrant by an officer authorized to serve criminal process, or by any railroad, railway or railway express police officer, and kept in custody in jail or other convenient place not more than twenty-four hours, Sundays and legal holidays excepted, at or before the expiration of which time he shall be taken before a proper court or magistrate and proceeded against according to law. If such person commits such offense in the presence of such officer and refuses to state his name and address at the request of such officer, he may be arrested by him without a warrant.