Tamsui–Xinyi line

The Tamsui–Xinyi or Red line (code R) is a metro line in Taipei operated by Taipei Metro. It is named after the districts it connects: Tamsui and Xinyi. It includes a total of 28 stations serving the Tamsui, Beitou, Shilin, Datong, Zhongshan, Zhongzheng, Daan, and Xinyi districts. At 29 km (18 mi), it is currently the longest line of the Taipei Metro.

The line is split in to two parts, the Tamsui Line and the Xinyi Line.

The Tamsui Line section runs mostly along the former Tamsui railway line. Most of the tracks and stations have been renovated there, except in the Zhongzheng district, where a new tunnel was constructed due to a lack of surface right-of-way.

After Taipei Main Station, the line runs under Gongyuan Road and serves NTU Hospital station, then cuts through a handful of buildings and arrive at Chiang Kai-Shek Memorial Hall station on Roosevelt Road.

The Xinyi Line mostly runs under Xinyi Road with the exception for the section between Chiang Kai-Shek Memorial Hall station and Dongmen station, where the line runs through the garden of Chiang Kai-Shek Memorial Hall.

The Red line is a high-capacity rapid transit system. The route and stations between and including Minquan West Road and Xiangshan are underground; the routes and stations between and including Yuanshan and Beitou are elevated; Xinbeitou station is elevated; the route and stations between and including Fuxinggang and Hongshulin are ground level; and Tamsui station is elevated.

It has connecting tracks to both the Songshan-Xindian Line and the Zhonghe-Xinlu Line.