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. (April 2017)
The Bannan or Blue line (code BL) is a metro line in Taipei operated by Taipei Metro, named after the districts it connects: Banqiao and Nangang. It has a total of 23 stations serving the districts of Nangang, Xinyi, Daan, Zhongshan, and Wanhua, Banqiao and Tucheng.
A Bannan Line train pulling into Dingpu station
The entire line runs underground. The excavation of tunnels using the cut-and-cover method resulted in large scale detouring of road traffic. Because of that, the line runs beneath existing roads and totals 28.3 km (17.6 mi).
- 8 November 1990: The Nangang section begins construction.
- 30 December 1991: The Taipei Main Station western underground passageway opens.
- 24 December 1993: Nangang section construction at the intersection of Zhongxiao East Rd and Shaoxing Rd caves in, causes traffic jams.
- 30 October 1998: Construction is completed on the tunnel between Kunyang and Houshanpi.
- 24 December 1999: The segment from Taipei City Hall to Longshan Temple begins revenue service.
- 31 August 2000: The segment from Longshan Temple to Xinpu begins revenue service.
- 30 December 2000: The segment from Kunyang to Taipei City Hall begins revenue service.
- 17 September 2001: Typhoon Nari floods many stations, rendering them nonoperational.
- 29 November 2001: Taipei Main Station re-opens for service.
- 30 December 2003: The Nangang section eastern extension to Nangang begins construction.
- 17 November 2004: The Nangang section eastern extension to Taipei Nangang Exhibition Center begins construction.
- 27 May 2006: The segment from Banqiao to Tucheng opens for trial operations.
- 31 May 2006: The segment from Xinpu to Yongning begins revenue service.
- 16 May 2008: The Nangang section eastern extension to Nangang begins trial service.
- 25 December 2008: The Nangang section eastern extension to Nangang begins revenue service.
- February 27, 2011: The rest of the Nangang section eastern extension to Taipei Nangang Exhibition Center opened for service.
- 21 May 2014: The 2014 Taipei Metro attack occurs between Longshan Temple and Jiangzicui when 21-year-old university student Cheng Chieh attacked passengers with a fruit knife, leading to 4 deaths and 24 injuries.
- 6 July 2015Dingpu Station begins revenue service, the final expansion of the line.
: The Tucheng Section extension to
- 28 September 2018: Half-height platform edge doors are installed in Tucheng, making all stations on this line and entire Taipei Metro system have some form of platform doors.
As of December 2017, the typical off-peak service is: