14.66 km, the Dapoling Tunnel in Yongping County, Dali 330-km-long Dali-Ruili railway, which is a key section of the China-Myanmar international railway corridor, according to China Railway Kunming Group Co., Ltd.
English news
http://www.china.org.cn/china/Off_the_Wire/2021-07/30/content_77663624.htm
cover tunnel photo by: Matt Brown from London, England / CC BY
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http://www.china.org.cn/china/Off_the_Wire/2021-07/30/content_77663624.htm
Major tunnel on China-Myanmar railway drilled through - China.org.cn
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