On August 1, in the section between Huchao Railway Station and Machang Railway Station on the Guizhou section of the Shanghai-Kunming Railway, four large-scale track maintenance machines were roaring as over 100 CR-Chengdu workers carried out ballast bed disease remediation and tamping operations on the mainline tracks. This marks the full launch of the 2025 intensive maintenance project on the Guizhou section of the Shanghai-Kunming Railway.