Photo taken on June 18, 2017 shows the "Lifeline Express", a mobile hospital set up on a train, in northwest China's Xinjiang Uygur Autonomous Region. The express, set up in 1997, provides free cataract surgeries for those patients in need, especially for poor residents suffering the disease in vast rural areas. The trains have helped to restore the vision of 180,000 cataract patients. (Xinhua/Li Mingfang)
