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The engine in question is #28254 CP Lionmaster SD-90 from the CP Diesel Freight Set #30026.

Initial problem I noticed was as soon as the track power came on the smoke fan started. Then I noticed when I pressed a couple buttons on the Legacy remote the horn went off. I hit Reset on the remote and then the ditch lights started flashing...

When running the engine forward it was very jerky, reverse was just fine. OK time for the hard reset. Went through the directions, used #8 and everything appears to have cleared up but the jerking moving forward. And to add to the confusion it doesn't do it around the whole way, only a small section. I remember the engine acting the same way last year in the same area and I know I don't have the same track in the same spots... I'm at a loss...

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I would add a power feeder wire to the section of track where it is doing.  Ive had similar issues and it wasn't getting enough power, even if you have transformer at full power.  In my experience TMCC engines need more power feeders  to run better. Also I would have a power drop between switches.  I don't think TMCC engines pickup enough power between switches without a feeder being present.

When I had this same issue on my MTH subway set, it turned out to be a broken gear in the drive train.  A single tooth on one of the small gears had broken off. Not cleanly right at the base, but about one half of the side of the tip.  Thus in one direction there was enough metal to engage the other gear, but in the the opposite direction there was a void and the broken tooth wouldn't engage until the unit had been forced further ahead by the second motor.  Everything moved smoothly by hand on it too, only a visual inspection found it.

Some simple stuff, before you tear it apart.

1. Wheels need to be clean, spot-less.

2. Same for the third rail pick-up contact.  A light oil-ing of the contact roller may help.

3.  Trucks with side gear assemblies, can pick debris, from the rails.

4. Track continuity.   Track joints can loosen over time.

5.  Track needs to be clean, top of rail.

Now you can tear it apart. 

@Mike CT posted:

Some simple stuff, before you tear it apart.

1. Wheels need to be clean, spot-less.

2. Same for the third rail pick-up contact.  A light oil-ing of the contact roller may help.

3.  Trucks with side gear assemblies, can pick debris, from the rails.

4. Track continuity.   Track joints can loosen over time.

5.  Track needs to be clean, top of rail.

Now you can tear it apart.

Thanks Mike, did all those before I posted!

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