The project officially started in September 2020 and now is progressing in an orderly manner. The line starts at the high-speed railway station in Dujiangyan City and ends at Siguniangshan Town, Xiaojin County, Aba Prefecture. The design length of the entire line is about 123.18 kilometers, and the maximum designed operating speed is 120 kilometers per hour. As a rail transit project of running track, cogwheel is also the first mountain rail transit poverty alleviation project in Sichuan Province.

In view of the characteristics of the mountain line, the project’s running track adopts a double-track meter-gauge design, and at the same time, a new cog-rail EMU was developed. On steep road sections, dual-system traction with steel wheels, steel rails and rack and pinion is used to improve traffic capacity. In order to protect the ecological environment, the projects mostly pass through bridges and tunnels, and the ratio of bridges to tunnels across the line reaches 98.34%.

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