Ohio Revised Code Title XLIX. Public Utilities § 4963.08

No superintendent, trainmaster, yardmaster, or other employee of a railroad company doing business in this state shall allow or permit a passenger or freight car to stand on a track commonly called a running track, within yard limits, unless a flagman or red light is on the end of the car during the period from thirty minutes before sunset to thirty minutes after sunrise.

The public utilities commission shall enforce, and prosecute any violations of this section.