Colonization of the Moon
If multiple bases were established on the lunar surface, they could be linked together by permanent railway systems. Both conventional and magnetic levitation (Maglev) systems have been proposed for the transport lines. Mag-Lev systems are particularly attractive as there is no atmosphere on the surface to slow down the train, so the vehicles could achieve velocities comparable to aircraft on the Earth. One significant difference with lunar trains, however, is that the cars would need to be individually sealed and possess their own life support systems.
List of maglev train proposals
Baltimore – Washington D.C. Maglev: A 39 Mile (64 km) project has been proposed linking Camden Yards in Baltimore and Baltimore-Washington International (BWI) Airport to Union Station in Washington, D.C. It is in demand for the area due to its current traffic/congestion problems. Based on the Japanese design with the backing of the Japanese government, in November 2013 the company set up to promote it offered to build the guideway and propulsion system for nothing. As of January 2014, the Japanese government has offered to provide financing for half of the estimated $8 billion construction cost. On Saturday 7 November 2015, the office of Maryland Governor Larry Hogan announced that the state had received a $27.8 million grant from the U.S. Department of Transportation to assess the feasibility of a superconducting maglev train line between Baltimore and Washington DC. A maglev train is a super-high-speed rail system that already exists in other parts of the world, reaching speeds of 373 miles per hour in Japan.