Photo taken on June 22, 2016 shows the section of the Qinghai-Tibet railway near the Tanggula Mountains, northwest China's Qinghai Province. The 1,956-kilometer-long Qinghai-Tibet railway, the world's highest altitude train line, has been put into service for 10 years. It links Lhasa, capital of southwest China's Tibet Autonomous Region, and Xining, capital of Qinghai Province in northwest China. [Photo: Xinhua]