VERY VERSATILE and good looking I adapted these for 3-rail Atlas track. I connected the bumpers to track power, so that when i turn the spur off, I know i can safely add new cars to the spur without fear of a short. The red light is nice and the feet have holes so you can anchor down the bumpers with screws (so a car actually bumping it with some force will not dislodge the bumper. Each of the 4 feet have metal clips to get common power. The center just below the lamp has a metal contact for the center rail. (I extended this to adapt to Atlas track, since it has a lower profile.