I was using a USAT speeder then an Aristo 2 axle switcher then a PIKO saddle tanker so the wheel base was pretty short on these .
I thought you had hit it Dan. I was using a 5003 power pack. I then tried a LGB 50081 which didn’t help then tried a USAT transformer “The Sounder” 20M and none of them worked properly. I actually have another aristo reverser that worked fine with the LGB 50081 so first I swapped out one then both of the rerailers just in case it was a bad diode in this used setup I just bought. It didn’t help. When the loco moved it went over the rerailer and kept on going.
I then disconnected the used reverser unit and hooked the one that I know works and it worked the same. When the loco moved it would go over the rerailer and not stop crashing through the track bumper?
When I get home later today I will give it another shot but I cannot imagine what is going wrong. I cleaned the track but maybe I will try a new shiny piece.