A train runs at the foot of snow-covered mountains in northwest China's Qinghai Province, October 24, 2009. The Qinghai-Tibet railway will enter its 4th winter operation after three year's safety running, which strongly boosted the economic and social developments in Qinghai and Tibet Autonomous Region. [Xinhua]

A train runs on the Qinghai-Tibet railway at an altitude of 4,767 metres at the Kunlun Mountain pass in northwest China's Qinghai Province, October 24, 2009.  [Xinhua]