I have about 100 cars of varying quality with both horn and knuckle couplers. I found you can trim down horn types and they funtion fairly well but it is difficult connecting them. So rather than conver half my cars and engines, I took several cars and swapped couplers on one end so these will accoumadate anything. sign1 Now I can mix them up for a frieght consist or make a whole coal drag with about 25 hoppers. Same with log cars and my Shays.