On July 21, after 290 days and nights of continuous effort, the No. 3 Tunnel of Ziluoshan on the Xiong'an New Area–Xinzhou High-Speed Railway (Shanxi section) was successfully holed through. The breakthrough of Ziluoshan No. 3 Tunnel marks the successful completion of yet another key project on the line, laying the foundation for opening up the passage for subsequent girder-erection work.

The Xiong'an–Xinzhou High-Speed Railway connects the Xiong'an New Area of Hebei Province with Xinzhou City of Shanxi Province. It is designed for a speed of 350 km/h, with a main line length of approximately 342 km, of which about 122 km lies within Shanxi Province. Ziluoshan No. 3 Tunnel is located in the southeastern part of Ziluoshan in Wutai County, Shanxi Province. The tunnel has a total length of 836.57 m and a maximum burial depth of 86.73 m, with a longitudinal gradient of 30‰ downgrade throughout.

Since the start of tunnel construction, the contractor has earnestly implemented the requirements for intelligent high-speed railway construction, carrying out scientific planning and organized implementation with respect to the tunnel access road, ventilation, water and power supply layout, resource allocation, construction organization, and construction techniques and methods. It has also built an integrated safety information management platform featuring personnel and vehicle positioning, video monitoring, and one-touch emergency alarm and public-address functions, enabling all-round real-time monitoring of tunnel construction and effectively enhancing comprehensive emergency response and safety management capabilities in tunnel construction.

Since construction began, the project builders have employed multiple technical measures and means—including advanced geological forecasting, monitoring and measurement, and advanced support—to ensure tunnel construction safety in every respect. To ensure the safe exit of the tunnel through the shallow-buried loess section, construction strictly followed the principles of "short advance, strong support, rapid sealing, and frequent measurement," achieving rapid excavation, rapid support, and timely sealing, thereby increasing the tunnel's overall resistance to deformation, successfully passing through the shallow-buried loess section, and safely achieving full breakthrough of the tunnel.