@CAPPilot posted:...On my previous layout, also command control, I wired the uncoupler's screw terminal to the center rail of the track (through its switch), not to a transformer. Nobody has mentioned this so I was wondering if there was a reason for not doing this? I don't remember having problems with it.
Command control uses a constant voltage from a transformer, usually 18V. The uncoupling track needs to see a certain amount of voltage to operate the magnet and can operate on 18V. So yes, it will work, but now you expose yourself to problems encountered by receiving power from a rail. These problems can include disruption to power drops (broken solder joint, loose connection), power drop location, loose connections between sectional track, and power consumption by locomotives using the same track.
