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Longest tunnel on Beijing-Zhangjiakou high-speed rail network achieves new milestone

chinadaily.com.cn | Updated: 2018-11-12 13:46
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Machinery works in the Zhengpantai tunnel for Beijing-Zhangjiakou high-speed railway in Chongli, North China's Hebei province, on Nov 10, 2018. [Photo/CGTN]

With dozens of award winning scientific and technology innovations, the engineers and workers conquered the complicated geological conditions by increasing the number of side and drainage cavities.

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