Pennsylvania Statutes Title 52 P.S. Mines and Mining § 70-809. Driver or motorman to leave trip of cars in safe place

When a driver or motorman has occasion to leave his trip he shall see that it is left in a safe place, securely blocked or spragged and where it will not endanger the drivers or motormen of other trips or other persons. He shall not leave any cars standing where they may materially obstruct the ventilating current, except in case of accident, which he shall promptly report to the mine foreman or his assistant. When it is his duty to open a door for the purpose of passing his trip through, he shall see that the door is immediately closed thereafter.