Reply to "Wiring a second TPC300"

so will my set up work?   From the wiring diagram you posted, you need one more wire from Comm on the Left TPC (1.) to Comm on the Right TPC. (2.)

I think I follow you Z4000 handle discussion, but note that the TPC can be programmed to work either:

conventional Program TR, #, M, Set  with the PRG/RUN switch to PRG

command Program TR, #, L, Set  with the PRG/RUN switch to PRG

from fixed power sources, PH 135 shown in my pictures,  or the Z4000's with the handles open/set to the desired track voltage.  At that point you are running either Conventional or command via the Cab1 hand held/TPC.