(a) Each locomotive operated on the line of any railway in this state shall be equipped with a signal bell and a signal whistle or horn. In addition, every railroad company shall equip each locomotive used on its main line after dark with a good and sufficient headlight which shall consume not less than 300 watts at the arc, and with a reflector not less than 23 inches in diameter, and shall keep the same in good condition.

(b) As used in this Code section, the term "main line" means all portions of the railway line not used solely as yards, spurs, and side tracks.

(c) This Code section shall not apply to tramroads, mill roads, and roads used principally for lumber or logging transportation in connection with mills.

(d) Any railroad company which violates this Code section shall be guilty of a misdemeanor.