Nation's largest TBM rolls off assembly line

China's largest tunnel boring machine — with a diameter of 16.64 meters — rolled off the production line in Changsha, Hunan province on Thursday.

The machine, weighing around 5,000 metric tons and 145 meters long, is the largest TBM designed in the country and has been named Jianghai — the Chinese equivalent of river and ocean.

The machine is jointly developed by China Railway Construction Heavy Industry Corp Ltd and China Railway 14th Bureau Group Co Ltd (CR14G), both units of China Railway Construction Corp, a centrally administered State-owned enterprise.