Published onJune 4, 2026With 3,500 tons and 15 meters in diameter, China already has the largest tunnel boring machine in the world for high-speed trainstunnelchinaboringdiametermachinesuchmeterslargestChina has just introduced Jiaoping No.1, the world's largest earth pressure balance (EPB) TBM designed specifically for high-speed railway tunnels. According to the state broadcaster CGTN, it is a...