A train is seen in a test run on the city railway S1 line in Wenzhou, east China's Zhejiang Province, Jan. 17, 2019. The city railway S1 line, based on the high-speed train technology, is expected to be put into trial operation in Wenzhou at the end of January. (Xinhua/Xing Guangli)

　　Passengers take a train in a test run on the city railway S1 line in Wenzhou, east China's Zhejiang Province, Jan. 17, 2019. The city railway S1 line, based on the high-speed train technology, is expected to be put into trial operation in Wenzhou at the end of January. (Xinhua/Xing Guangli)

　　Passengers take a train in a test run on the city railway S1 line in Wenzhou, east China's Zhejiang Province, Jan. 17, 2019. The city railway S1 line, based on the high-speed train technology, is expected to be put into trial operation in Wenzhou at the end of January. (Xinhua/Xing Guangli)

　　Passengers take a train in a test run on the city railway S1 line in Wenzhou, east China's Zhejiang Province, Jan. 17, 2019. The city railway S1 line, based on the high-speed train technology, is expected to be put into trial operation in Wenzhou at the end of January. (Xinhua/Xing Guangli)

　　A train is seen in a test run on the city railway S1 line in Wenzhou, east China's Zhejiang Province, Jan. 17, 2019. The city railway S1 line, based on the high-speed train technology, is expected to be put into trial operation in Wenzhou at the end of January. (Xinhua/Xing Guangli)