I believe I experienced something for the 1st time yesterday. At the Science Museum of VA show there were 3 O gauge layouts in the Rotunda.......our "small venue" layout. Our 21X36 layout and another 3 rail group. The other 3 rail group was using TMCC. Our main layout was using TMCC/Legacy through a cab 1L.
I was running conventional on the small layout. DCS engines ran great in conventional......my TMCC engines acted as if they where possessed! They would run for a while......and then just stand there. I gave these engines to Gilly@N&W who was running on our large layout (2 TMCC and 1 Legacy).....they all worked fine in command mode.
I suspect the TMCC/Legacy field was confusing them!
Peter