The Taichung Line (Chinese: 台中線 or 臺中線; pinyin: Táizhōng Xiàn), also known as the Mountain Line (Chinese: 山線; pinyin: Shān Xiàn), is a line of the Taiwan Railway Administration. It is It has a total length of 85.5 km, of which all but 2.2 km (the Chengzhui Line from Chenggong to Zhuifen) is double track.