“八纵八横”高铁网再添新进展：渝昆高铁川滇段隧道全线贯通

Core Points - The Yibin Junlian Tunnel, the last tunnel of the Chongqing-Kunming High-Speed Railway (Yukun High-Speed Railway) Sichuan-Yunnan section, has successfully been completed, marking a new phase in the project construction [1][3] - The tunnel is 7,888 meters long and is located in the transitional zone between the Sichuan Basin and the Yunnan-Guizhou Plateau, making it a key engineering project due to its complex geological conditions [3] - With the completion of this tunnel, all 28 tunnels in the Sichuan-Yunnan section of the Yukun High-Speed Railway have been connected, and the project is now moving into the ballastless track construction phase [3] Industry Impact - The Yukun High-Speed Railway is a crucial part of China's "Eight Vertical and Eight Horizontal" high-speed rail network, connecting major regions and enhancing transportation efficiency [5] - The railway will span approximately 700 kilometers, starting from Chongqing West Station and ending at Kunming South Station, with a designed speed of 350 kilometers per hour [5] - Once completed in 2026, the travel time between Chongqing and Kunming will be significantly reduced, strengthening the economic ties between the Chengdu-Chongqing economic circle and the central Yunnan region [5]