How do trains pull so much weight? I’ve seem them with hundreds of freight and gas tanker cars.
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Steel wheels on steel rails roll quite easily, you can find newsreel footage of a circus strongman moving a single freight car or more from a dead stop back in the days before roller bearings. I’ve seen it done in real life by a rather large coworker, I’m not very big and I’ve done it with a chunk of 2×4 as a lever and a rock as a fulcrum a handful of times.
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