Group 1 - The Xi'an-Yan'an High-Speed Railway is the first in Northwest China to achieve full-line public 5G coverage, enhancing passenger internet experience during travel [1] - The railway has implemented a continuous and stable communication network through the installation of leakage cables in tunnels and combination angle steel towers outside tunnels, contributing to its "smart energy" [3] - The high proportion of bridges and tunnels in the Xi'an-Yan'an High-Speed Railway raises questions about maintaining uninterrupted signal during train operations in tunnels [4]