2-454: The Bannan or Blue line (code BL ) is a metro line of Taipei Metro in Taipei , Taiwan, with a total of 23 stations serving the districts of Nangang , Xinyi , Daan , Zhongshan , Wanhua , Banqiao and Tucheng . The line's name is a portmanteau of Banqiao and Nangang. 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,
4-579: The line runs beneath existing roads and totals 28.3 km (17.6 mi). Service on this line is divided into a full-length service from Taipei Nangang Exhibition Center to Dingpu , as well as a shorter service from Kunyang to Far Eastern Hospital . Due to Taipei City Hall being at the centre of the Taipei 101 New Year's festivities, intervals between trains can be reduced to a minimum of 135 seconds, transporting up to 39,000 passengers per hour. This results in an average of about 27 trains per hour on
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