Constructors work inside Guantian Tunnel in China's Hunan

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Constructors worked inside the Guantian Tunnel of the Zhangjiajie-Jishou-Huaihua high-speed railway, central China's Hunan Province, on Dec. 3.

XinhuaUpdated: December 4, 2018

Constructors work inside the Guantian Tunnel of the Zhangjiajie-Jishou-Huaihua high-speed railway, central China's Hunan Province, Dec. 3, 2018. The 246.6 km-long high-speed railway will pass through Zhangjiajie City, Tujia-Miao Autonomous Prefecture of Xiangxi and Huaihua City with a designed speed of 350 km per hour. [Photo/Xinhua]

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