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Elon Musk's Hyperloop dream gains speed

It started as a fanciful idea straight out of science fiction, but theHyperloop is starting to pick up real speed.

The Hyperloop is Elon Musk's vision for a train that can move passengers and cargo between cities at speeds of more than 700 miles per hour. The plan, unveiled in 2013, calls for pressurized, above-ground tubes that span hundreds of miles.