The Kadee Under-the-Track Uncoupler is a great choice for model railroaders. It fits HO, S, O, and On30 scales (in fact, all scales). This uncoupler has a 'hidden' installation under the track. It comes with a permanent magnet, a steel intensifier plate, and easy - to - follow instructions. It's suitable for various scales from HO to O - Scale, but please note that the track is not included. For O - Scale, due to thicker ties and higher rails, you may need to stack 2 or 3 magnets and put one steel intensifier plate at the bottom of the stack. You might also need to trim the bottom of the ties on some tracks to get the magnet closer to the rails. The set includes one Delayed Action Magne - Matic® Uncoupler and one steel intensifier plate.

Using this Kadee Under - Track Permanent Magnet Uncoupler is easy. First, install it under the track according to the included instructions. It has a 'hidden' installation, which will keep your model railroad looking neat. For HO, S, On30 scales, one magnet usually works well. But if you're using O - Scale, stack 2 or 3 magnets and place a steel intensifier plate at the bottom. You may need to trim the bottom of the ties on some tracks to fit the magnets closer to the rails. As for maintenance, keep the magnets and the intensifier plate clean. Avoid exposing them to extreme heat or moisture, as this can affect their performance. Check them regularly to make sure they're still in good condition and properly installed. If you notice any issues, refer back to the instructions or contact customer support.