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.
High-speed rail in China
Maglev received a big boost in 2000 when the Shanghai Municipal Government agreed to purchase a turnkey TransRapid train system from Germany for the rail link connecting Shanghai Pudong International Airport and the city. In 2004, the Shanghai Maglev Train became the world's first commercially operated high-speed maglev. It remains the fastest commercial train in the world with peak speeds of and makes the trip in less than 7.5 minutes.
Despite unmatched advantage in speed, the maglev has not gained widespread use in China's high-speed rail network due to high cost, German refusal to share technology and concerns about safety. The price tag of the Shanghai Maglev was believed to be $1.3 billion and was partially financed by the German government. The refusal of the Transrapid Consortium to share technology and source production in China made large-scale maglev production much more costly than high-speed train technology for conventional lines. Finally, residents living along the proposed maglev route have raised health concerns about noise and electromagnetic radiation emitted by the trains, despite an environmental assessment by the Shanghai Academy of Environmental Sciences saying the line was safe. These concerns have prevented the construction of the proposed extension of the maglev to Hangzhou. Even the more modest plan to extend the maglev to Shanghai's other airport, Hongqiao, has stalled. Instead, a conventional subway line was built to connect the two airports, and a conventional high-speed rail line was built between Shanghai and Hangzhou.