BEIJING, Feb. 4, 2016 -- Crew member Li Chao clears up curtains on the Z21/22 train, which interlinks Beijing, capital of China, with Lhasa, capital of southwest China's Tibet Autonomous Region, on Feb. 3, 2016. The Z21/22 train will readjusted to interlink Shenyang, capital of northeast China's Liaoning Province, to Lhasa on February. The Z21/22 train, which started operation on July 1 in 2006, has carried 9.9 million passengers by Feb. 1 of 2016. (Xinhua/Tang Zhaoming)