Technicians collect data during a joint test of Sichuan section of Xi'an-Chengdu Passenger Railway, southwest China's Sichuan Province, July 3, 2017. The Xi'an-Chengdu Passenger Railway, the first high-speed railway travelling through the Qinling Mountains with projected speed of 250 kilometers per hour, started a joint test Monday in its Sichuan section. (Xinhua/Xue Yubin)