China unveils largest homegrown tunnel boring machine by diameter
Updated: September 16, 2026 Source: Xinhua News Agency
16.68 meters across. China's largest homegrown tunnel boring machine (#TBM) by diameter rolled off the production line on Tuesday in the central city of Zhengzhou. Measuring 125 meters in length, it weighs about 4,800 tons.
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Editor: Yang Linlin
