UPDATED: see below posts --
I recently bought the MTH DCS Remote Commander set as a basic way to control my MTH trains in command mode. Up until now, I'd been operating my only Proto-Sound 2.0 engine in conventional mode with my Lionel Legacy controller using Lionel TPC's. I remember asking the question a while back about if it was possible to hook up the Remote Commander to an existing Lionel Legacy set up, upon which I was told to hook the remote base to the track and it should operate the MTH engines independently, at the same time with Lionel Legacy engines in command mode (on different trains, of course).
I think I got everything hooked up right. My Legacy base is connected to a Lionel TPC 300, which is being powered by a Lionel CW-80 transformer. The DCS Remote Commander base is hooked up using two separate wires on the same track. I assumed that the red plug is for the hot (center) rail and the black plug is for the ground (outer) rail, and hooked it up as such. When I powered up the track, set the TPC to command mode, and applied power using my Legacy remote, the green indicator light on the Remote Commander base lit up, and flashed with each push of the Remote Commander remote, just as described in the manual.
However, my engine isn't responding the way it should be. My engine is the RailKing Scale BNSF SW1500 w/Proto-Sound 2.0, MTH #30-2467-1. It apparently is from 2005. Sometimes, you can tell power is being applied but there's only a slight humming sound inside - no lights come on, and pressing the SU/SD button doesn't cause anything to happen. I reset the engine to factory defaults and had the same result. Other times the sounds come on right as track power is applied, and the horn or bell start sounding continuously - it's as if the engine isn't recognizing the command base and going to conventional mode instead. I'm now afraid my engine may be too old for the DCS Remote Commander, but I don't remember what determines that. I'm planning on getting new MTH engines that I know are compatible, but I'd like to make sure that this engine isn't before I do. Or maybe I don't have something wired correctly, or the DCS Remote Commander doesn't like the CW-80 or TPC's or something? Any help would be great!