
CHANGCHUN, June 16, 2016 (Xinhua) -- Photo taken on June 16, 2016 shows the air conditioner equipment supplying oxygen on the train Z722 from Changchun of northeast China's Jilin Province to Lhasa of southwest China's Tibet Autonomous Region. The Z722 and Z21 trains from Changchun to Lhasa are equipped with oxygen supply equipments for passengers. They used 25T air conditioner train and started to operate on Feb. 26. (Xinhua/Wang Haofei)

