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 monitor track data 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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