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flag China's largest high-speed rail tunneling machine dug over 10,000 meters under the Yangtze River on Dec. 16, 2025.

flag On December 16, 2025, China's "Linghang" shield tunneling machine, the world’s largest for high-speed rail, surpassed 10,000 meters of excavation beneath the Yangtze River. flag The tunnel, part of the Shanghai-Chongqing-Chengdu High-Speed Railway, spans 14.25 kilometers from Chongming, Shanghai, to Taicang, Jiangsu, and is designed for 350 km/h trains. flag The milestone marks major progress in China’s high-speed rail infrastructure and demonstrates advancements in domestic tunneling technology.

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