Henry Ernest Dudeney/Modern Puzzles/211 - Another Wheel Paradox

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Modern Puzzles by Henry Ernest Dudeney: $211$

Another Wheel Paradox
When a railway train is in motion, it is always the case that some parts of the train are travelling backwards.
Explain why.

Dudeney couches this paradox in a tediously long-winded conversation between a pair of cyclists leaning on a bridge.

Click here for solution