# Nanning

Climbing for Safety: How a Chinese Railcrew 'Registers' Rocks to Keep Trains Crossing the China–Vietnam Border

On the Xianggui railway’s Nanning section, a specialised maintenance team known as the “climbing tigers” inspects and mitigates rockfall risks on karst cliffs that threaten China–Vietnam rail traffic. Combining drone-AI scans with dangerous cliffside work and a rigorous record-keeping system that operators call “giving stones household registration,” the crew keeps trains running safely during busy travel periods.