Musk unveils plans for $10 billion Hyperloop

Air cushioning: That's the high-concept technology behind the high-speed transit concept that billionaire Elon Musk calls the Hyperloop.

Musk - who already plays leading roles in the SpaceX rocket venture, the Tesla electric car company and the SolarCity solar-energy company - unveiled what he has called the "alpha" version of the Hyperloop plan in a blog post on Monday. It runs to 57 pages as a PDF file.

The plan is aimed at cutting the travel time between San Francisco and Los Angeles to a half-hour, at a price that's less than an airline ticket between those two cities. Musk said the Hyperloop arrangement could be implemented between any pair of cities situated up to, say, 900 miles (1,500 kilometers) apart. For longer distances, air travel would probably be more efficient, he said.

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