I think the old Lionel DCDRs used the same FETs as the ERR stuff? I’d have to go look though. I have a few in the stash. Anyone remember how those DCDRs used to slam motors to a reversed voltage stop at high speed/direction change? I have a project on the bench right now with one. Brought back memories!
Have you guys ever tried getting those small extruded aluminum heat sinks for the rectifiers?