Hello OGR,
If anyone has read this chain I will provide you the FINAL update here.
Turns out fast action breakers on my ZW(L) transformer had nothing to do with any power on/off control of sidings, or on any track for that matter.
My ZW(L) had been twice sent in under warranty RA for repair, and my Legacy Control had also been sent in twice under warranty RA for repair. Getting those two pieces back from their second repair trip to Lionel has revealed that in CMD mode for the ZW(L) zero volts is coming out to the track. CONV mode does product volts to track - albeit not the publicized 18v+ per ZW(L) output ... more like 16+ or 17+ volts across the four outputs.
Now I must navigate the world of post-warranty for possibly both pieces of equipment, with replacements at the elevated market prices they demand. Unsatisfactory - yes.
This POST chain is now CLOSED.
- Ken