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Experts estimate it will cost between $6.5 and $7 billion to build the Hyperloop.

Although thefinancial and technical chal- lenges are numerous,Musk vows to push on. In 2015, his rocket company, SpaceX, announced a competition for engineers to come up with the best design for the

See the ideas behind the amazing Hyperloop

pod. SpaceX also plans to build a one-mile test track for those who enter the competition.Musk is taking the ideas of Hyperloop transportation on the same journey of innovation that he took cars and space travel. Vac-Trains Musk isn’t the only innovator trying to speed things along. Although he believes vacuum tubes are not the most efficient way to move people, teams of researchers in the United States, China, and elsewhere are looking at ways to create a vacuum train that could hit speeds of up to 2,500 miles (4,000 km) per hour, cutting the commute fromEurope to NorthAmerica to just one hour. The idea is to pump all of the air out of a sealed tube and shoot a train or some other contraption through it like a bullet through the barrel of a gun. In a vacuum tube there is little air resistance to slow down the train.

TheHyperloop and theVac-Train are just two of several futuristic modes of transportation that could reshape the world.Whether