(a) Upon the line of each railway and at a point 400 yards from the center of its intersection at grade with any public road or street used by the public generally in crossing the tracks of the railway, and on each side of the crossing, there shall be erected by the railroad company operating the railway a blowpost to indicate the existence of the crossing.

(b) The engineer operating the locomotive of any railroad train moving over the tracks of the railroad shall be required, when he reaches the blowpost, as a signal of approach to the crossing, to blow through the whistle two long blasts, one short blast, and one long blast, said blasts to be loud and distinct. In addition thereto, after reaching the blowpost farthest removed from the crossing, and while approaching the crossing, the engineer shall keep and maintain a constant and vigilant lookout along the track ahead of said engine, and shall otherwise exercise due care in approaching the crossing, in order to avoid doing injury to any person or property which may be on the crossing or upon the line of the railway at any point within 50 feet of the crossing.

(c) Any railroad company which fails to erect and maintain blowposts as required by subsection (a) of this Code section shall be guilty of a misdemeanor.

(d) Any locomotive engineer who violates subsection (b) of this Code section shall be guilty of a misdemeanor.