One last obvious question ... just checking for fear of mistakes:
The TVS diodes often recommended here on the OGR forum (from Digi Key - 1.5KE36CA - for use around ZWs, and elsewhere) being bi-directional, when I install one at the Fastrack track level connecting one diode end to HOT and the opposite diode end to COMMON just before track connection, it does NOT matter which TVS diode end connects to which wire - correct!
I have them on the ZWs across output posts that way, but moving them out closer to trains at track level in many possible places ... I just thought it best to ask the dumb question now before installing other TVS Diodes!
Thanks, Ken