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Maintenance workers work at Xinguanjiao Tunnel in NW China's Qinghai 

      

      
 Source: Xinhua| 2018-06-29 22:37:56|Editor:  Li Xia 

      

            
      

      

      

      

      

      
    

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      CHINA-QINGHAI-XINGUANJIAO TUNNEL-MAINTENANCE (CN)
      

      Maintenance workers check equipment at the Xinguanjiao Tunnel, the world's longest plateau rail tunnel, along the Qinghai-Tibet Railway in northwest China's Qinghai Province, June 27, 2018. With a length of 32.6 kilometers, the tunnel was put into operation at the end of 2014. (Xinhua/Hou Deqiang)
      

      

      

      


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