Athearn PA Repair Help

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Here is a video regarding the PA
I meant to post this a while ago. I have noticed that some of my track work is not perfect but other locos seem to run alright on it.
The surging seems to take place when the locomotive is on a curve or coming out of it, which is when the trucks are pivoting. I would still recommend soldering wires from the truck pickup to the contact strip atop the motor. That is a simple thing, and only if that doesn't solve the problem would you need to go to other things.
 




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