Tamsui–Xinyi line

A sign at Taipei Main Station in 2007. The line, then known as Tamsui and romanised as Danshui line, operated to Nanshijiao and Xindian.

For 15 years, trains operated between Tamsui and Xindian via the southern part of the current Songshan–Xindian line, making it the longest-serving former service of the system, followed closely by a 13 year service from Beitou to Nanshijiao via the southern part of the current Zhonghe–Xinlu line that lasted 13 years. With the completion of Dongmen station, Xinyi Line and Songshan Line, both services ended, placing the current form of the Tamsui–Xinyi line into effect.

• July 1988: Tamsui Line begins construction.
• 28 March 1997: Tamsui Line begins service from Tamsui to Zhongshan.
• 25 December 1997: The section from Zhongshan to Taipei Main Station begins service.
• 24 December 1998: The section from Taipei Main Station to Chiang Kai-shek Memorial Hall begins service. The section of Chiang Kai-shek Memorial Hall and Guting on the Xindian line opened along with the Zhonghe line allowing trains from Tamsui to travel to Nanshijiao.
• 11 November 1999: The rest of the Xindian Line opened. Trains from Tamsui traveled to Xindian and the Zhonghe Line route was cut back to Beitou.
• 1 November 2002: Ground broken on Xinyi Line construction.[1]
• 12 February 2010: Corridor approved by the Executive Yuan for the Xinyi line eastern extension.
• 15 July 2010: The last section of shield tunneling is completed, marking the completion of tunnel construction.[2]
• 29 September 2012: With the opening of Dongmen the last trains between Beitou and Nanshijiao were launched ending the through services; trains now operate between Nanshijiao and Huilong or Luzhou. A new shuttle service from Beitou to Taipower Building was added temporarily until the Xinyi Line opened.
• 15 October 2013: The line completed its preliminary inspection.[3]
• 23 November 2013: With the opening of the Xinyi line, the last trains of the Beitou-Taipower Building shuttle service were launched; trains operated between Beitou and Xiangshan and between Taipower Building and Ximen via the Xiaonanmen line.
• 24 November 2013: The section between Chiang Kai-shek Memorial Hall and Xiangshan opened and began revenue service.[4]
• 14 November 2014: With the opening of the Songshan line, the last trains between Tamsui and Xindian were launched at 12:00 November 15, 2014 ending the through services; trains now operate between Xindian or Taipower Building and Songshan and between Tamsui or Beitou[lower-alpha 2] and Daan[lower-alpha 2] or Xiangshan.

Over the years, the Tamsui Line used different types of rolling stock. From the start, the line used C301 cars. In 1997, the C321 cars were introduced. In 2007-2013, the newest cars, the C371 and C381 cars were used, replacing some of the C301 and all C321 cars. Originally this line used a large fleet of C371 trains when they were introduced but when the Tamsui and Xindian Lines split in 2014, the use of the C371 on the Tamsui line was discontinued.

As of December 2017, the typical off-peak service is:

• 8 trains an hour (tph) between Tamsui and Xiangshan
• 7 tph between Beitou and Daan

• Xinbeitou branch line