and . This section became the first east–west line running through the city, connecting the two previously completed north–south lines. On 31 May 2006, the second stage of the Banqiao–Nangang section and the Tucheng section began operation. The service was then named Bannan after the districts that it connects (Banqiao and Nangang). Maokong Gondola On 4 July 2007, the Maokong Gondola, a new aerial lift/cable-car system, was opened to the public. The system connects the , , and Maokong. Service was suspended on 1 October 2008 due to erosion from mudslides under a support pillar following Typhoon Jangmi. The gondola officially resumed service as of 31 March 2010, after relocation of the pillar and passing safety inspections. 2009–2014 expansions On 4 July 2009, with the opening of the Neihu segment of , the last of the six core segments was completed. Due to debate on whether to construct a medium-capacity or high-capacity line, construction of the line did not begin until 2002. was extended from to and in 2012. The Xinyi section of and Songshan section of were opened on 24 November 2013 and 15 November 2014 respectively. Prior to 2014, only physical lines had official names; services did not. In 2008, the and Xiaonanmen services were referred to by termini while Bannan and Wenhu services were referred to by the physical lines on which they operated. Following the completion of the core sections of the system in 2014, the naming scheme for services was set and 'lines' started to referred to services. Between 2014 and 2016, lines were given alternative number names based on the order of the dates the lines first opened. Brown, Red, Green, Orange and Blue lines were named lines 1 to 5 respectively. The planned Circular, Wanda–Shulin and Minsheng–Xizhi lines were to be lines 6 to 8 respectively. In 2016, the number names were replaced by colour names. Today, on-board announcements in Chinese use full official names, whereas in English, colour names are used instead. 2020 expansion On 31 January 2020, the Circular line opened as the sixth main line of the Taipei Metro. Stage I construction consists of 14 stations running from on to on and is about long. Electromechanical equipment for the line is supplied by Hitachi Rail STS, including driverless technology and CBTC Radio signalling. In February 2020, free rides were offered to passengers in order to raise awareness and test the