Reporters from Azerbaijan AZ TV interview staff member of Tianjin Metro Line 1 Rail Transit Operation Co Ltd, in Tianjin, North China, on Dec 15, 2025. [Photo/chinadaily.com.cn]

The intelligent upgrading of Tianjin Metro Line 1 also amazed global guests. The line features a driver monitoring system that uses AI facial analysis to real-time track drivers' facial features and postures as well as detect fatigue and distraction. A 360-degree vehicle exterior image detection system can identify loose screws and foreign objects, while an intelligent vehicle operation and maintenance system monitors door operations, driving modes, and traction braking levels. This human-machine collaboration enhances efficiency and reduces maintenance costs.