The Taichung line (Chinese: 臺中線 or 台中線; pinyin: Táizhōng Xiàn; Pe̍h-ōe-jī: Tâi-tiong Soàⁿ), also known as the Mountain line (Chinese: 山線; pinyin: Shān Xiàn; Pe̍h-ōe-jī: Soaⁿ-sòaⁿ), is a line of the Taiwan Railway Administration, which one of two parallel lines in Central Taiwan section offsetting to inland mountain area. It has a total length of 85.5 km, all of which is double track, passing Downtown Taichung.