No railroad doing business in this state shall operate or permit to be operated in this state, a locomotive regularly assigned in mine run, drop or package local freight, or switching service which is not equipped with two or more footboards.

The public utilities commission shall prescribe the dimensions, location, and the manner of application of said footboards.

As used in this section, “regularly assigned” means more than three consecutive days.

No railroad doing business in this state shall send or cause to be sent out on its railroad a locomotive which is not equipped in accordance with this section.

The commission shall enforce this section.