How a Train Stays on a Track (not as simple as you thought)

Richard Feynman (1918 – 1988) was an American physicist known for the path integral formulation of quantum mechanics, the theory of quantum electrodynamics and the physics of the superfluidity of supercooled liquid helium, as well as work in particle physics. For his contributions to the development of quantum electrodynamics, he received the Nobel Prize in Physics in 1965. During his lifetime and after his death, Feynman became one of the most publicly known scientists in the world. Source: Wiki

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Physicist Richard Feynman explains how a train stays on the tracks... From BBC TV 'Fun to Imagine' (1983)