If it runs smoothly on straight track, highly unlikely it’s an axle binding. ....if an axle is binding, I’d think it would act up no matter what the track is....if you’re having issues going into a curve, I’d look at the articulation parts. If it’s just slowing down in a curve, that would be the nature of the beast, and certainly some modern cruise components will fix this....perhaps a video of it running on straight track, then put it into a curve, may help you get a better diagnosis, or at least a direction to go in.......Pat
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