Machinists inspect conditions of high-speed trains in Urumqi, NW China

Machinist Cao Guoqiang inspects a bullet train at the high-speed trains service station in Urumqi, capital of northwest China's Xinjiang Uygur Autonomous Region, Feb. 19, 2019. More than 170 machinists work in the service station to inspect the conditions of high-speed trains and ensure the safety of passengers. (Xinhua/Ding Lei)