The Tamsui line was a single track line with passing sidings at most stations. Sidings range from just over 1 mile apart to the maximum distance between Zhuwei and Tamsui which was a 2.6-mile segment.
Passing sidings that allows trains to pass each other on the single track were located in: Shuanglien, Yuanshan, Shihlin, Peitou, and Chuwei. Service north of Peitou was more intensive.