Are you using TMCC or Legacy? Are the Engines TMCC or Legacy? People tend to use the term TMCC fairly loosely? Do you have 3 or more tracks running side be side or tracks running over top of the others where they stall? If they are stalling at the same location it seems as though you have a TMCC signal issue with the track. I am under the impression Legacy cured a lot of the signal issues that TMCC encountered. Do you have other TMCC engines that run over the same section without this problem? What track are you using. If you are using Gargraves track do you have both outside rails grounded? Is the house recepticle 2 or 3 prong. You need to be thorough when describing which system you are using and the configuration of your layout where these signal issues occur. Are you using DCS now? The Proto3 upgrade kit sells for $199.99. Less for MTH club members. Expect to pay $100.00 to $150.00 for Labor plus the cost of the kit.
The engines and system that I use are TMCC and are not legacy models/systems. I have one loop of track that is conventional while the rest of the trackage on the layout is DCS and TMCC compatible for command operation. I run both DCS and TMCC on my layout.
The RS-11 won't run on the tracks period without crawling for a few feet and stopping. It doesn't matter what part of the layout it is on it just won't run.
The SD40T-2 runs fine except for a certain area of track next to my control panel. Every time it hits two certain spots, it will stall. I had one day where it managed to run around the layout in reverse with no problems but since then it continues to show the same issue.
The area of track in question in the case of the tunnel motor is two switches that are close to a diamond crossover I have. (see photo for reference). The left track in the image is connected by the turnouts of two MTH Realtrax 0-31 switches that help create a perimeter loop around the layout. In this section of track, my tunnel motor will stall in between those switches. The track where the DT&I coal drag is running in this photo (center) leading up to the diamond crossover is the other spot where I am having issues. The tunnel motor will also stall to a stop on the curve or just after the curve almost immediately.
My control panel is directly next to this part of the layout and my TMCC command base and DCS TIU is located directly under the control panel and this part of the layout. All of my other Lionel engines (NYC Lionmaster Hudson, NYC Jr. Mikado from the Hot Box Reefer Set, SP JC Penny MU Interurban, UP GP-9, Century Club 671 Turbine) are TMCC non-legacy equipped engines and they do not display these problems whenever they are out running on the layout (most especially in the above mentioned location in regards to my tunnel motor). On a very rare occasion, the NYC Hudson will stall in that same area.
The tracks that I use are all MTH Realtrax and both outside rails are grounded all the way around. The house receptacle is 3 pronged.