Thoughts have turned to distribution of the DCC power/signal and the carving up of power districts. I've arrived at the following:
The grey boxes, top left, are circuit breaker boards, They receive the DCC power/signal from the NCE Master Panel and the power is split into three power districts, each with their own circuit breaker...cicuitry.
#1 District serves the upper fiddle yard and teh hidden main-line track all the way to the lift out section.
#2