Pennsylvania Statutes Title 52 P.S. Mines and Mining § 70-806. Runner to ride on rear end of cars running by gravity roads by sprags spaced not less than two feet on at least one side of the tracks

When cars are run on gravity roads by brakes or sprags, the runner shall only ride on the rear end of the last car, and when said cars are ran by sprags, a space of not less than two feet from the body of the car shall be made on one or both sides of the track, wherever it may be necessary for the runner to pass along the side of the moving car or cars, and said space or passageway shall always be kept free from obstructions.