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.
Transrapid
On 22 September 2006, a Transrapid train collided with a maintenance vehicle at on the test track in Lathen, Germany. The maintenance vehicle destroyed the first section of the train, then lifted off the track to complete two full rotations before landing in a pile of pre-exploded debris. This was the first major accident involving a Transrapid train. The news media reported 23 fatalities and that several people were severely injured, these being the first fatalities on any maglev. The accident was caused by human error with the first train being allowed to leave the station before the maintenance vehicle had moved off the track. This situation could be avoided in a production environment by installing an automatic collision avoidance system.