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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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