Uber-industrialist Elon Musk on Monday released the alpha plans for his proposed Hyperloop high-speed travel system between San Francisco and Los Angeles. The Hyperloop will consist of streamlined capsules riding like hovercraft on an air cushion in a steel tube with solar arrays on its roof to provide power to the system. The tube will be supported every 100 feet by pylons. Linear accelerators will be constructed at various points along the tube’s length. Two tubes will be welded side by side to allow travel in both directions.