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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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      KEY WORDS: tunnel
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