Billionaire entrepreneur Elon Musk's vision for a futuristic Hyperloop transportation system concept involves sleek passenger capsules flying within a tube on a cushion of air. Solar panels along the entire length of the tube provide more power than needed to run the system. Hyperloop Unveiled: Billionaire Elon Musk Reveals Wild Idea for Superfast Travel
Hyperloop Explained: How Elon Musk's Futuristic Transit System Works (Infographic)

Hyperloop speeds capsules containing up to 28 passengers each through low-pressure tubes at just under the speed of sound.
(Image: © by Karl Tate, Infographics Artist)
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