A technician works on a new subway train at CRRC Qingdao Sifang Company in Qingdao, east China's Shandong Province, Dec. 21, 2017. The subway train, possessing the highest international standard for fire safety, came off the assembly line in Qingdao on Thursday. The train was developed for downtown lines in Hong Kong, south China. (Xinhua/Zhang Jingang)