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Check the back-to-back gauge on your wheelsets. My Athearn AC4400 had a problem very similar to the one you describe, I eventually discovered that the wheelsets were not set to the correct gauge - they should be around 14.5mm back to back. On my loco, the axle gears were slightly too wide to allow the wheelsets to be correctly gauged, so I had to pull out the wheels (they're on stub axles that push into the gear), and file the sides of the gear to allow me to set the wheels a little closer together. It's now fine.
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