A staff member from the maintenace crew checks a train in Chengdu, capital of southwest China's Sichuan Province, July 8, 2013. Known as the "Train Hospital", the maintenance crew provide 24-hour-services for examining and cleaning trains. (Xinhua/Xue Yubin)

Staff members from the maintenace crew clean a train in Chengdu, capital of southwest China's Sichuan Province, July 8, 2013. Known as the "Train Hospital", the maintenance crew provide 24-hour-services for examining and cleaning trains. (Xinhua/Xue Yubin)

Staff members from the maintenace crew examine the windows of a train in Chengdu, capital of southwest China's Sichuan Province, July 8, 2013. Known as the "Train Hospital", the maintenance crew provide 24-hour-services for examining and cleaning trains. (Xinhua/Xue Yubin)

Photo taken on July 8, 2013 shows the trains in the station waiting to be cleaned in Chengdu, capital of southwest China's Sichuan Province, July 8, 2013. Known as the "Train Hospital", the maintenance crew provide 24-hour-services for examining and cleaning trains. (Xinhua/Xue Yubin)

A staff member from the maintenace crew examines the braking system of a train in Chengdu, capital of southwest China's Sichuan Province, July 8, 2013. Known as the "Train Hospital", the maintenance crew provide 24-hour-services for examining and cleaning trains. (Xinhua/Xue Yubin)

Staff members from the maintenace crew clean a train in Chengdu, capital of southwest China's Sichuan Province, July 8, 2013. Known as the "Train Hospital", the maintenance crew provide 24-hour-services for examining and cleaning trains. (Xinhua/Xue Yubin)

Staff members from the maintenace crew clean a train in Chengdu, capital of southwest China's Sichuan Province, July 8, 2013. Known as the "Train Hospital", the maintenance crew provide 24-hour-services for examining and cleaning trains. (Xinhua/Xue Yubin)