That was the purpose of the "Buckeye" exhaust high pitched whistle. I had a lieutenant who would chastise the junior man if he didn't ring the bell in the rhythm that he wanted. It had to be steady on our return to quarters. They were getting out of the practice of washing the tires to remove the horse poop even though the horses were gone. The job might have to get back into that with what is going on in Manhattan today with the homeless.