The tube is out back, 11 feet in diameter, 60 feet long, the unfinished end spiraling into wide ribbons of steel—like a gigantic Pillsbury dough container with its seams gaping open. Behind the tube is a big blue tent known as the robot school, where autonomous welders wheel or crawl along, making the tubes airtight. The goal is to put tracks and electromagnets inside the tube and vacuum the air out. Ultimately, capsules will scream through the center of such a tube at 700 miles per hour on a cushion of air—a way to get from A to B faster and more efficiently than planes or trains. The first public tests of this concept, albeit on an open-air track, will take place in North Las Vegas this week. They’re aiming to hit 400 miles per hour.
Entrepreneur Elon Musk introduced the world to the concept of a giant vacuum-tube transportation system, the Hyperloop, two and a half years ago. The basic idea is to build a partially evacuated tube, inside which capsules would float on a layer of air, pulling themselves along with a fan and getting extra propulsion from electromagnets in the tube’s walls. Musk talked of trips from San Francisco to Los Angeles in 35 minutes, with off ramps at each end loading and unloading pods with 28 seats every two minutes. Although the design was ambitious to the point of being outlandish, none of its components were fundamentally unproven, something often overlooked. But Musk was too busy revolutionizing the space industry (as CEO of his company SpaceX), the automotive industry (as CEO of his other company, Tesla Motors), and the energy industry (as chairman of his other other company, SolarCity), to devote any time to the Hyperloop. He released a 58-page outline of his implausible idea and left it to someone else to finish it off.
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