Tesla Motors and SpaceX aren’t Elon Musk’s only major transportation-related projects. In fact, he’s also working on a train system where passengers could be shipped between cities at speeds close to the speed of sound. Called Hyperloop, the train is a mix between the Concorde plane, a railgun, and an air-hockey table, according to the inventor. And while Musk might not be overseeing this one directly, the Hyperloop project is slowly advancing.
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