Undated file photo shows an interior view of a prototype magnetic-levitation train manufactured by CRRC Qingdao Sifang Co. Performance checks of China's domestically-developed prototype magnetic-levitation train, with a designed top speed of 600 km per hour, began in Shanghai Sunday. The testing prototype, which has only one car, can check and optimize the key technologies and core system components of the high-speed maglev system and lay a technological basis for the forthcoming engineering prototype, according to CRRC Qingdao Sifang Co., the train maker headquartered in eastern China's Shandong Province. (Xinhua)