R2LC Reset

I think it really depends on the locomotive.  I'd post the model and see if anyone else has one and can tell you how theirs run.

It's a Chessie System SD40-2 (6-28524) that first appeared in the Classic Trains, Vol. 2 catalog in 2001.

Catnap-

A reset might be in order. I have a few TMCC diesels, and the marker and running board lights are always on. Changing direction should only turn the appropriate headlights on or off. It's also possible that there could be a wiring short or the R2LC board might be damaged, but try the reset first.

-John

Here you go, custom tailored for your model.  Looks like a standard diesel reset.

Yeah, I saw that in the back of the instruction manual. I just have to get my command set back from Lionel.

I was having issues running my Atlas TMCC SD40 with my CAB-1L/Base-1L Command Set. I even sent the locomotive back to Atlas thinking there was something wrong with it. Their head service tech tested it with a 990 LEGACY Command Set and said it ran fine. He experienced the same issues I did when using the CAB-1 "Lite." He said he was going to try and "tune" the command base to improve the TMCC signal. Apparently, Lionel is going to do the same thing.

Interestingly, I had no problems whatsoever sending commands to my LEGACY engines. Even my ProtoSound 3 locomotive worked fine, albeit in conventional mode.