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
Keystone Corridor: According to Transrapid, Inc., Pittsburgh has the most advanced maglev initiative in the U.S., followed by the Las Vegas project. Once federal funding is finalized, these two markets could be the first to see maglev in the United States. Initially, the project calls for a transrapid system throughout the metro Pittsburgh area. Further planning calls for extensions eastward to Harrisburg and Philadelphia. Upon completion, a commute from Pittsburgh to Philadelphia would be reduced to 90–120 minutes. A commuter traversing the Pennsylvania Turnpike would currently spend approximately 5hrs if traveling at the speed limit.