The construction of the Heiyanzhai Tunnel of the New Yuyuan High-speed Railway has been successfully completed.

On the morning of September 12th at 9 o'clock, with the successful implementation of the last explosion, the newly constructed Chongqing to Wanzhou high-speed railway Black Rock Ridge Tunnel has been successfully connected, marking an important progress in the construction of the new Chongqing-Wanzhou high-speed railway project.