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In this June 22, 2012 photo, Tesla CEO Elon Musk waves during a rally at the Tesla factory in Fremont, Calif. Musk on Monday, Aug. 12, 2013 unveiled a concept for a transport system he says would make the nearly 400-mile trip in half the time it takes an airplane. The "Hyperloop" system would use a large tube. Inside, capsules would float on air, traveling at over 700 miles per hour. (AP Photo/Paul Sakuma, File)