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Get back to basics.

How does it run in conventional mode?

Run the engine by itself on a test track do the same symptoms persist?

Remove the variables caused by your consist, track, and transformer. Heck I'd even turn it upside down and run it at various speeds with alligator clips providing the power. This will give you good visuals as to the performance of the motors. Monitor amperage draw closely.

Last edited by H1000
The fix: back to the tach reader. I moved the tach reader away from the flywheel by a very small amount. I carefully, gently bent the bracket so as to increase the gap between the reader and the tape. I have about an hour's run time on it since I did this and it's now a happy camper.
Thanks to all who tried to help.

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