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DAMXUNG COUNTY, CHINA - DECEMBER 21: (CHINA OUT) A train runs on a bridge through Shengen Village of Gongtang Town December 21, 2010 in Damxung County of Tibet Autonomous Region, China. The 1,956km Qinghai-Tibet railway crosses high altitudes to link Xining in Qinghai Province to Lhasa in Tibet Autonomous Region of China. The railway has helped boost the construction, tourism and service industries in previously remote areas. (Photo by China Photos/Getty Images)

DAMXUNG COUNTY, CHINA - DECEMBER 21: (CHINA OUT) A train runs on a bridge through Shengen Village of Gongtang Town December 21, 2010 in Damxung County of Tibet Autonomous Region, China. The 1,956km Qinghai-Tibet railway crosses high altitudes to link Xining in Qinghai Province to Lhasa in Tibet Autonomous Region of China. The railway has helped boost the construction, tourism and service industries in previously remote areas.  (Photo by China Photos/Getty Images)