"No track access while trains are running; no trains while track access is underway" — this is a saying among us high-speed rail maintenance workers. With trains speeding by during the day, maintenance and inspection work on the high-speed line can only be carried out between 0:00 and 5:00 a.m. after trains stop running. "Tan Peng" is "a deputy foreman at the Huyi Communications Work Area of the Xi'an Communications Section, China Railway Xi'an Group Co., Ltd." All maintenance work, large and small, within the work area is arranged by him. Everyone affectionately calls him "Brother Tan." Tan Peng is a veteran; the habits he formed during his time in the military have made him exceptionally meticulous and hardworking in his approach to work.

Wearing headlamps and uniform yellow protective suits with reflective markings, carrying toolboxes and ladders, they walk in line through the long tunnel. Whenever they reach a equipment chamber, they crouch down — you inspect the equipment, I clear foreign objects — with a clear division of labor, everyone working with great enthusiasm, "the tools in their hands moving as freely as a surgeon's scalpel." When inspecting the leaky cables on the tunnel walls, they are all "as nimble as a hare" — in the 7- to 8-meter-high tunnel, they set up the ladder and climb up and down to check the leaky cable connectors and clamps on the tunnel walls. One of the inspection tasks of the "Huyi Communications Work Area" is to regularly service these communications facilities and rectify hidden dangers promptly. Just then, Tan's young apprentice beside him, "Little Wu," suddenly spoke up: "Master, why are the cables on the tunnel wall so much thicker than the ones we usually see, and why do they have to be hung on the tunnel wall?" (Little Wu had just graduated from school and was the new apprentice Tan had recently taken on; he is very conscientious in his work and everyone likes him very much.) At this, the old-timer Tan Peng smiled and said: "This is called a 'leaky cable.' As the name suggests, a leaky cable can 'leak' out signals. When an EMU enters a tunnel, it cannot transmit signals through towers and must rely on the 'leaky cable' on one side of the tunnel to receive signals. Don't underestimate these seemingly inconspicuous cables — they not only transmit signals but also have a wireless transmission function. Wherever they are laid, the signal is covered there, so the EMU won't lose contact while running through the tunnel. That's why the leaky cables in the tunnel must be inspected regularly."

Among these few people, Deputy Foreman "Tan Peng," 33, is the oldest "old-timer." He joined the railway in 2014 and is also a "founding member" of the Huyi Communications Work Area. In Tan Peng's view, high-speed rail communications work is like maintaining the ears of the high-speed railway: during operation it can both hear information sent by others and speak its own situation out. He said: "The Huyi Communications Work Area has jurisdiction over 122.7 kilometers, connecting to Xi'an North Station in the north and Foping Station in the south. The most important task is maintaining the high-speed rail communications facilities along the 72-kilometer extra-long high-gradient tunnel and 10 tunnels. We manage China's only extra-long high-gradient tunnel in a mountainous area. Compared with other mountain high-speed railways, the maintenance and construction difficulty is much greater, so we must 'inspect meticulously and repair carefully' to ensure the safety of every 'Xi'an-Chengdu High-Speed Railway' train." As he said this, Tan Peng's eyes were filled with pride in the great future development of the railway.