The 10.3-mile tunnel will be the first portion of the underground hyperloop system that the SpaceX founder wants to build between Washington, D.C. and New York City.
Tesla's Elon Musk eyeing high-speed line to Chicago's O'Hare Airport
Line to O'Hare wouldn't utilize standard trains, but instead would offer smaller-sized passenger cars that would leave more frequently and travel at speeds of up to 125 mph via an "electric sled" propulsion technology.