The design of train wheels is genius. If we have a train track with a slight curve, and we try to roll some basic wheels across it, we'll simply derail. Okay, you might say, it's an easy fix. You could just add a flange so it doesn't derail. And while the flange does keep it from derailing, it can't really navigate a turn. So how exactly can we solve the issue of a train negotiating a turn?

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Thanks for watching and happy printing!
Steven