Everyday Science and Mechanics (December 1933)
I don't know if anyone was proposing this scheme for trains back in 1933 but it's both attractive and hilariously impractical if you think about it for a moment.
It reminded me to re-watch Feynman on “How the train stays on the track’ though.
https://www.youtube.com/watch?v=y7h4OtFDnYE
Original magazine: https://archive.org/details/everyday-science-and-mechanics-1933-12
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