Actually, I was thinking a

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Actually, I was thinking about it and on a tight bend, my design might not work because when the two wheel side bends around the track, the distance between them and the other side would be more (or less). Maybe the solution would be to use a T shape instead of the triangle and have some kind of mechanism that allows the t bar to extend and contract smoothly. Sounds easy enough right? This would also allow the track rails to vary in width slightly without any drag whatsoever.

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