Rick another way to troubleshoot it would be to run it upside-down in a cradle at very slow speed, while putting a little resistance on the wheels with one hand. As you run it more, IF the wheel is out-of-round or even not pressed on the axle straight, this will manifest itself by a different pattern of wear / grease / dirt on the wheel tread. So if you ever do decide to track it down that will provide a valuable clue. Enjoy your new loco!!
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