Two Workers Killed in Chiang Rai Railway Tunnel Collapse

Two construction workers died and two others were injured when part of the Doi Luang railway tunnel collapsed in Chiang Rai. The accident occurred on June 20 during work on the Den Chai–Chiang Rai–Chiang Khong double-track railway project. Engineers believe accumulated water within the surrounding rock layers may have weakened temporary support structures following years of unstable weather and heavy rain. Officials said the tunnel’s main structure remains stable, although construction was suspended while investigators conduct a detailed safety assessment. The 85-billion-baht railway is scheduled to open in January 2028 and will eventually connect northern Thailand with the Lao border.