The Circular line (; also known as Yellow line) is a medium-capacity rapid transit line on the Taipei Metro. The first section of this line is operated by New Taipei Metro Corporation and it runs between and in the Taipei metropolitan area. It is approximately long with 14 stations. The initial western section was opened on 31 January 2020. Hitachi Rail Italy supplied 17 sets of 4-car driverless medium-capacity trains for the line. Extensions are currently underway to form a full loop.

Construction Hitachi Rail STS supplied electromechanical equipment for the line, including driverless technology and CBTC signaling. , currently the only underground station on the line, was constructed by RSEA Engineering Corporation and employed the cut-and-cover method.

Construction for the first phase officially broke ground on 11 July 2011 on a elevated section between Zhonghe and Banqiao. The section is estimated to cost NT$13.7 billion, with the entire first-stage route estimated to cost NT$54.7 billion to construct.

The line includes the first elevated split platforms in the system at , , and due to the narrowness of the available station area.

The initial section between and opened on 31 January 2020. On 5 May 2023, the Circular line was transferred from the Taipei Metro to the New Taipei Metro, with the fare structure still integrated with the Taipei Metro system, unlike light rail lines of the New Taipei Metro.

Public art Unlike previous public art installations on the metro, it was decided that a smaller number of art pieces would be installed within the same budget, allowing for large-scale artwork.

Across the above ground section of the line, Emmanuelle Moureaux (a Tokyo based French architect and designer) spread distinctive bold colours across infrastructure – including steel beams and pillars, noise barriers, 13 stations and platforms, a bridge over the Tamsui River, and the exterior and interior design of the train.

The platforms, walls and ceilings of Banqiao station are decorated by French artist Daniel Buren, using regular, contrasting coloured stripes.

Stations The western section of the line officially opened on 31 January 2020. Services between Zhonghe and Banqiao were temporarily suspended from 3 April 2024 onwards due to the 2024 Hualien earthquake, with the repair work expected to take one year to complete. The section reopened ahead of schedule on 12 December 2024 at 12:00 PM Taiwan Standard Time.

Code Station name Station type Locale Sta. distance (km) Opened date Transfer Structure Platform Previous Total Circular line Continue with Y39 station Y1 Underground Island Wenshan Taipei 3.240 49.0790.000 2031-6 Y2 rowspan="5" 1.139 1.139 rowspan="5" Y3 1.061 2.200 Y4 1.170 3.370 Y5 0.989 4.359 Y6 Xindian New Taipei 0.586 4.945 0.721 5.666 2020-1-31 Elevated Side 1.559 7.225 Zhonghe 1.116 8.341 rowspan="2" 0.849 9.190 1.157 10.347 Split 1.440 11.787 0.635 12.422 rowspan="3" 0.732 13.154 Side Banqiao 1.392 14.546 0.952 15.498 1.423 16.921 (BL08) Xinzhuang 1.800 18.721 0.624 19.345 1.560 20.905 Y21 rowspan="3" Underground Island Wugu 0.900 21.805 2031-6 rowspan="3" Y22 1.369 23.174 Y23 Split Luzhou 0.977 24.151 Y24 Side 1.280 25.431 Y25 rowspan="4" Island 1.139 26.570 Y26 Sanchong 0.786 27.356 rowspan="3" Y27 Split Shilin Taipei 1.869 29.225 Y28 Island 1.085 30.310 Y29 0.675 30.985 Y30 rowspan="2" 0.537 31.522 rowspan="2" Y31 1.780 33.302 Y32 Split Zhongshan 1.984 35.286 Y33 rowspan="6" Island 0.928 36.214 2032-9 rowspan="5" Y34 Neihu 0.985 37.199 Y35 0.535 37.734 Y36 0.875 38.609 Y37 1.025 39.634 Y38 0.905 40.539 Y39 Songshan 1.685 42.224 Y40 Xinyi 0.825 43.049 Y41 1.790 44.839 Y42 Split 1.000 45.839 Continue with Taipei Zoo station References: 臺北都會區大眾捷運系統環狀線北環段及南環段暨周邊土地開發計畫綜合規劃報告書：

See also Rail transport in Taiwan

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