Why do trains run on tracks?
https://www.podtrac.com/pts/redirect.mp3/tracking.swap.fm/track/sblTq32fyWAjsHzze2LG/dovetail.prxu.org/_/326/074268fd-e768-41d2-b5ce-48b43eca2891/ButWhy_Trains_Ep254.mp3
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