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+ - Ultra-efficient 4,000 mph vacuum-tube trains – why aren't they being built-> 1

Submitted by cylonlover
cylonlover (1921924) writes "In the 1800s, when pneumatic tubes shot telegrams and small items all around buildings and sometimes small cities, the future of mass transit seemed clear: we'd be firing people around through these sealed tubes at high speeds. And it turns out we've got the technology to do that today – mag-lev rail lines remove all rolling friction from the energy equation for a train, and accelerating them through a vacuum tunnel can eliminate wind resistance to the point where it's theoretically possible to reach blistering speeds over 4,000 mph (6,437 km/h) using a fraction of the energy an airliner uses – and recapturing a lot of that energy upon deceleration. Ultra-fast, high efficiency ground transport is technologically within reach – so why isn't anybody building it? Gizmag's Loz Blain looks at some of the problems."
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Ultra-efficient 4,000 mph vacuum-tube trains – why aren't they being built

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