Finally got the layout to a point I can run things this weekend, and ran my Mogul for about an hour. Awesome smoker and great sounds, but jerky at low speeds, forward and backward. Didn't check for axle play, but I did notice the blind driver on the engineer's side was going up and down as the locomotive rolled along. I noticed it because I saw light under the wheel which meant there was an air gap as the wheel wasn't touching the rail. And as I watched, the gap size was changing as the wheel went around. So either the wheel isn't round, the axle isn't centered in the wheel, or the axle is bent or not trued to the frame.
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