Oh, I get it, it's the lowest part of the train wheel, below the actual contact point between wheel and track. Because the actual wheel is larger, the motion it makes is bigger than the actual forward motion, making part of it go backward , if that makes sense. I don't know how else to explain it really. I'm sure it has a name, I've heard it before, but can't quite remember it.




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(Note the racing gear in my avatar picture

Unfortunatly, it exploded. This is all that is left. Describe it in one word.
