I thought I seen or read it all, but really stumped. My friend is slowing getting Legacy/TMCC engines, but has a few conventional he likes. He has a MTH F3AA. With Proto Sound. Got a call and went over, here's the rest---
He has Lionel TMCC system with 135 power brick, etc. Today he said he put his conventional MTH F3 AA engines on the track, put the powermaster to conventional. The engines as power was added started its engine growl, then stops. The engine will run directionally with no engine sound, nor horn/bell. Also noticed that he needed to touch the "TRK" and #0 instead of TRK 1, to get power to track. He still had his transformer, so we wired it to the track, dropping the TMCC system,using just transformer control, Engine started up, engine sound, horn/bell, crewtalk, etc. all worked perfectly. I'm stumped? Any ideas?