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Citizens take subway line 1 in Xiamen, southeast China's Fujian Province, Oct. 11, 2017. It was the last day of the 6-day test operation of the subway line 1 that spans the sea in Xiamen. (Xinhua/Jiang Kehong)

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Subway line 1 runs on the Jixing Seawall in Xiamen, southeast China's Fujian Province, Oct. 11, 2017. It was the last day of the 6-day test operation of the subway line 1 that spans the sea in Xiamen. (Xinhua/Jiang Kehong)

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Citizens take subway line 1 in Xiamen, southeast China's Fujian Province, Oct. 11, 2017. It was the last day of the 6-day test operation of the subway line 1 that spans the sea in Xiamen. (Xinhua/Jiang Kehong)