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.
Forest.