Rising from an altitude of 30 meters at the Peimen Station to 2,216 meters up on Mt. Ali, the railway stretches for 71.34 kilometers and passes through 50 tunnels and over 77 bridges. Along the way, it ascends slopes with gradients as high as 6.25 %, and it makes one nearly 180 degree turn in only 40 meters.
火車從舊北門站開出，一路由海拔三十公尺攀登到二二一六公尺高的阿里山，全程經過五十個隧道，七十七座橋樑，全長七十一．三四公里，最大坡度達千分之六十二．五，最小曲線半徑只有四十公尺。