Art,
Getting back to your Western Pacific F-3 Dummy Unit, as John mentioned above, be sure to check the wiring especially if you've already tried replacing the R2LC.
Other things to try:
1) Remove and re-seat all three of the modular boards in your dummy unit, taking care to align the connectors properly when re-installation. Sometimes oxidation can build-up on these pins.
2) Note that Lionel recommends an unusual R2LC restore code (36) for at least the powered unit in your pair. (See link below.) I'm honestly unsure why the 3 is necessary, but I suppose it can't hurt to give it a try.
https://www.lionelsupport.com/...oreTMCCfunctions.pdf
You may want to try both the 36 as well as the standard 6 to see if either one will get your RailSounds dummy unit to respond correctly.
TRW