Passengers show their tickets on the first train operating on Zhengzhou-Xuzhou high-speed railway, Sept. 10, 2016. China's high-speed railways now exceed 20,000 km in length with the opening of a line linking Zhengzhou in central China's Henan Province with Xuzhou in eastern Jiangsu Province on Sept. 10, 2016. The line connects the west with two major north-south lines, helping cut travel time between west and east in the country. (Xinhua/Li An)
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