What keeps a train on the tracks while it’s turning?

Most people think that trains stay on the tracks while it’s turning because of the flanges on its wheels. Unfortunately, that’s wrong. Think about this as well – while there’s an axle connecting each of its adjacent wheels, there’s no differential in the middle of it. How does it turn without derailing? In the following video, deceased American physicist Richard Feynman explains the science behind trains.

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