§ 33.53. Pusher engines.
All common carrier railroads operating in this Commonwealth shall promulgate or modify existing operating rules and procedures for the government of their respective employes so as to require that the operation of a pusher engine or engines behind an occupied cabin or caboose car, in train, shall be used subject to the following conditions:
(1) If the horsepower to be used by a pusher engine or engines behind a cabin or caboose exceeds 3,500, the train crew shall, before such a move is made, vacate the cabin car and occupy the pusher engine or a cabin car or caboose behind the pusher engine or engines, and the train shall be brought to a stop before the pusher engine or engines are detached.
(2) The practice of ‘‘cutting off on the fly’’ pusher engines behind occupied cabin cars shall be limited to those instances in which the horsepower used by the pusher engine does not exceed 3,500.