Entrepreneur Elon Musk is about to publish an â€œalpha designâ€ for Hyperloop, an entirely new form of public transportation that is faster than the bullet train and potentially self-powering. Details are slim, but itâ€™s clear that Musk (as always) has lofty ambitions. In the past he has described it as a â€œcross between a Concorde, a railgun and an air hockey table,â€ although that says little of the underlying technology. In an interview last year, Musk described Hyperloop as the fifth major tent pole for modern transportation, placing it on a pedestal beside planes, trains, boats and automobiles. â€œThis system I have in mind, how would you like something that can never crash, is immune to weather, it goes three or four times faster than the bullet trainâ€¦ it goes an average speed of twice what an aircraft would do,â€ he said. â€œYou would go from downtown LA to downtown San Francisco in under 30 minutes.â€ He later added that it was possible for Hyperloop to be self-powered using solar energy; it would therefore generate more power than it consumed in day-to-day use. Hyperloop sounds like a too-good-to-be-true scenario. But Muskâ€™s track record with Tesla and SpaceX shows himÂ perfectly capable of delivering on ideas which many people think are unfeasible. Musk added on Twitter that he would be looking for â€œcritical feedbackâ€ and â€œimprovementsâ€ for the initial design once itâ€™s released to the world next month. Hyperloop might still shrouded in mystery, but it wonâ€™t be much longer before we know a lot more about Muskâ€™s intentions. Planes, trains, automobiles: take notice.