Hours of labor on street railroads

§ 164. Hours of labor on street railroads. No employee engaged in the operation of a street surface or elevated railroad of whatever motive power owned or operated by a corporation whose main line or route of travel lies principally within a city of the first or second class, shall be employed more than ten consecutive hours, including one-half hour for dinner, in any day, except that in cases of accident or unavoidable delay extra work may be performed for extra compensation.