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.
California–Nevada Interstate Maglev
Operating on a dedicated track, it would not be subject to delays from freight trains, a problem that plagued the old Amtrak service. As a high-speed service, it would be able to compete with airlines for passengers, especially from the outlying areas of Southern California.