When did they stop using them? Probably for safety reasons, leading to and stemming from, situations like this.....
I remember two kids walking the tracks near our ball field one day must have found one and attached it to a rail, because about 20 minutes later BANG!and a northbound (F series) freight train with only a few empties, screeched to a halt, and the most P.O.-ed guys you've ever saw jumped from the cab, and caboose, and started running after everyone in the field (private, not RR property), the "engineer" finally catching one girl. Seeing how they didn't kill her, or beat her, figuring a parlay to be a God given right, and not being guilty of anything, or even knowing what the bang was about, or of a torpedoes function yet, we decided to approach her captors to find out what was wrong. They let her go, but.. Mistake! Once near enough the "conductor" grabbed 2 boys, and handed one off to the "engineer". They listened, then called us liars, and the beating of two of the bigger older boys they had began. Luckily a few local grown ups made their way there quickly, having heard the torpedo, and train wheel screeches. Not seeing the crowd of locals coming, they were caught off guard and stammering excuses till one rather large father gathered the kids(and RR people) to hear what we all had to say. Bruises on one boy, issued by the "conductor", were beginning to show already, and a mob of PO-ed mothers began to surround him. "Hold him" the big dad said grabbing a handfull of engineer bib strap. The guy in the striped bibs had been giving "spankings" so got a few "big hand" open slaps, and a hard kick in the butt as he scurried back to the cab. The "conductor" was quite old, so was held down for the boy to hit for a while, he left with blackened eye, and a nicely split lip. Soon the police arrived, local and railroad. And it turned out the "conductor" was also RR Police. Standing there in his opened dress shirt dirty, and blood stained enough that it soaked to his stark white t-shirt, and still nursing his lip with his handkerchief, he was shocked, as his superior made him apologize to the boy from his split lip(more blood). Nobody was arrested that day, but after that we hid behind trees from cabooses the next few years. Why? Because of the occasional pellet gun shot coming from the rails. I wonder who it was?.