China Railway Eighteenth Bureau Group learned that after 991 days of fighting, the Changsheng Tunnel, a high-gas high-risk tunnel of the Chengdu-Dazhou to Wanzhou high-speed railway, was successfully completed on December 8, marking significant progress in construction and laying a solid foundation for the completion and opening of the entire line to traffic.

China Railway Eighteenth Bureau Group learned that after 991 days of fighting, the Changsheng Tunnel, a high-gas high-risk tunnel of the Chengdu-Dazhou to Wanzhou high-speed railway, was successfully completed on December 8, marking significant progress in construction and laying a solid foundation for the completion and opening of the entire line to traffic.