Tesla car creator introduces concept design for Hyperloop high-speed train

CNN - Just how fast would the Hyperloop transportation system envisioned by entrepreneur Elon Musk have to be? Try more than twice as fast as the fastest commercial train in the world.

On Monday, Musk unveiled details about what he called a highly speculative project. But, when the guy speculating has already sent private rockets into outer space, you can't count him out.

Musk believes the Hyperloop, with giant vacuum-like tubes and an air-bearing suspension system, could ferry riders from Los Angeles to San Francisco in 35 minutes.  Read more.