A new subway train is seen at the off-line ceremony 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. (Xinhua/Zhang Jingang)