On the 23rd, the Qinling Mabaishan Tunnel of the Xi'an-Shiyan High-speed Railway with a total length of 22.9 kilometers was successfully completed.
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22.9公裡!全國最長高鐵隧道貫通--經濟·科技--人民網
finance.people.com.cn科技日報北京4月23日電(記者何亮)23日,全長22.9公裡的西安至十堰高鐵(以下簡稱“西十高鐵”)秦嶺馬白山隧道順利貫通,這是目前國內已貫通的最長高鐵隧道。隨著該隧道的順利貫通,標志著西十高鐵建設取