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.
Maglev
The construction of a maglev track using the technology from Ramenskoye started in Armenian SSR in 1987
and was planned to be completed in 1991. The track was supposed to connect the cities of Yerevan and Sevan via the city of Abovyan. The original design speed was 250 km/h which was later lowered to 180 km/h.
However, the Spitak earthquake in 1988 and the Nagorno-Karabakh war caused the project to freeze. In the end the overpass was only partially constructed.