Core Viewpoint - The article highlights the critical role of 5G technology in ensuring reliable communication for high-speed trains operating in the West Extension High-Speed Railway, particularly in tunnel environments where signal integrity is essential for safety and passenger experience [1]. Group 1: Maintenance Operations - The maintenance team, led by Ma Jinjing, undertook urgent repair tasks at the Yijun Tunnel, addressing issues such as a cable leak and signal attenuation [1][3]. - The team successfully identified and fixed a faulty cable joint that was causing abnormal signal reflection, completing the task within a tight four-hour window [3][5]. Group 2: Technical Innovations - The West Extension High-Speed Railway employs a new "leak cable introduction" technique, which relocates critical cable joints to cable trenches, reducing the risk of equipment falling off and facilitating easier maintenance [4]. - The installation of leak cables is designed to ensure seamless signal coverage by strategically placing them at heights corresponding to train windows and roofs, effectively creating a "signal corridor" [5][6]. Group 3: Performance and Reliability - The newly repaired cable joint achieved a reflection coefficient of 1.1, which is better than the standard of 1.5, ensuring stable wireless communication between train and ground control systems [5]. - The railway's design incorporates advanced anchoring techniques to withstand the extreme conditions created by high-speed trains, ensuring the durability of the communication infrastructure [6].