The RY models would accept the Electric RR drive board with an R2LC board in the fuel tank area. It may have been designed that way.
Note the custom cuts to increase the wire access.
R2LC board installed.
Fuel tank re-installed.
To get the Electric RR sound board in I had to remove two large capacitors and install them remote in one end of the hood. The board just fits, allowing room for the motor swing.
Capacitors remote location.
Sound board installed, note where the capacitors have been removed and relocated. Large circles on the green board with hash marks.
Speaker in the other hood end.
Electro-couplers, part of Atlas articulated couplers.
I had used the existing RY board to operate the LED head lights but the board failed and I hooked the LED's to the Electric RR board in series with a 1000 ohm resistor (each).
RY board that was removed. Bottom of picture, board has white foam sticky back material.
Antenna is still an issue, a coil wire on one walkway, works well.
I also added an engineer, should have added glass to the windows, and covered the Atlas couplers with an Atlas part used with the SW9 couplers.
IMO, a wonderful, challenging project. Should be interesting to see Sunsets 3rdRail's production model. At the time there were a few TAS upgrades to TMCC, I don't know if they attempted sound. The ERR sound board is poor at best. The horn is O.K. Mike