China Railway Siyuan engineers have built the world's first high-speed rail tunnel whose construction was primarily directed by artificial intelligence, achieving 89.41% accuracy in selecting excavation methods through Wufeng County's extremely complex geology. The AI system, trained on 1,700 tunnel sections from historical data, navigated fault lines and caves to guide human crews building the 350km/h railway line. In the mountainous heart of China, where jagged karst landsc