The main line of Zhangtang starts from the kongjiazhuang station in Zhangjiakou area, and the Zhangjiakou Railway is connected. The project has successively crossed Beijing Baobao, Jingtong, Jingcheng, Beijing Harbin, Daqin, Cao relocation and other lines; There are three contact lines of Beijing Tong, Beijing Chengcheng and Beijing Kazakhstan. The construction of the railway adopts 12 Hertz high voltage capacitors.