GRJ,
The TMCC DCDR issue I was referring to was on a Lionel RS11 that I fixed previously. It had a similar issue when cycling between forward and reverse. The driver had a MOSFET grounding to the mount because the insulator pad had worn through.
The conventional K-Line board that I’m currently working on has 2 large relays at one end. They click when I attempt to cycle the e-unit to forward or reverse. They don’t act up when cycled to neutral. Here’s a pic of the electronic reversing unit I found online:
