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China: Big progress for Chongqing-Kunming High-speed Railway tunnel building

    Caihong Wen
    By Caihong Wen

    Sanguanlou Tunnel is (5,623 meters long and a maximum burial depth of 882 meters) finished

    http://finance.people.com.cn/BIG5/n1/2025/0311/c1004-40436051.html

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    cover tunnel photo by: Matt Brown from London, England / CC BY

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