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A comment on Caltrain's electric fleet more efficient than expected. Parent comment
Even a model/toy train wagon can easily coast the length of a large room when given a push.
See how little metal is in contact, about 1cm²: https://www.reddit.com/r/Damnthatsinteresting/comments/17ysd...
There's very little friction.
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Even a model/toy train wagon can easily coast the length of a large room when given a push.
See how little metal is in contact, about 1cm²: https://www.reddit.com/r/Damnthatsinteresting/comments/17ysd...
There's very little friction.