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

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.

Sources

• 1926: Henry Ernest Dudeney: Modern Puzzles ... (previous) ... (next): Wheel Paradox Problems: $211$. -- Another Wheel Paradox
• 1968: Henry Ernest Dudeney: 536 Puzzles & Curious Problems ... (previous) ... (next): Geometrical Problems: Circle Puzzles: $295$. Another Wheel Paradox