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posted by Jason Kottke  ·  gift link

Why Don’t Trains Need Differential Gears?

The other day I posted a video about how differential gears work to help cars go smoothly around curves. Trains don’t have differential gears, so how do they manage to go around curves without slipping or skidding? Richard Feynman explains:

Ha, it looks like I’ve posted this one before as well. Can never get enough Feynman. (thx, kerry)