Delayed "under-the-track" Uncoupler.
Under the track "hidden" installation. A permanent magnet and steel intensifier plate are included along with instructions. Suitable for a variety of scales from HO to O-Scale. Track not included
Because of the thicker ties and higher rail in O-scale, it will be necessary to use 2 or 3 magnets stacked together and one steel intensifier plate on the bottom of the stack (fig. 6). On some track you may need to trim the bottom of the ties to fit the magnet(s) closer to the rails.