Circular line (Taipei Metro)
The Circular or Yellow line is a metro line operated by Taipei Metro. The first phase of the project consists of the section from to and is approximately long with 14 stations. This initial section was opened on 31 January 2020. Hitachi Rail Italy supplied 17 four-carriage medium-capacity trains for the line.
Construction
supplied electromechanical equipment for the line, including driverless technology and CBTC Radio signalling., 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 platform in the system at,, and due to the narrowness of the available station area.
Stations in operation
The western section of the project is fully completed and is officially open on 31 January 2020.Western Section
| Code | English name | Chinese name | Districts | Notes |
| Y07 | 大坪林 | Xindian | Change for | |
| Y08 | 十四張 | Xindian | Planned connection to | |
| Y09 | 秀朗橋 | Zhonghe | ||
| Y10 | 景平 | Zhonghe | ||
| Y11 | 景安 | Zhonghe | Change for | |
| Y12 | 中和 | Zhonghe | Planned connection to | |
| Y13 | 橋和 | Zhonghe | ||
| Y14 | 中原 | Zhonghe | ||
| Y15 | 板新 | Banqiao | ||
| Y16 | 板橋 | Banqiao | Change for , TRA, and THSR | |
| Y17 | 新埔民生 | Banqiao | Change for at | |
| Y18 | 頭前庄 | Xinzhuang | Change for | |
| Y19 | 幸福 | Xinzhuang | ||
| Y20 | 新北產業園區 | Xinzhuang | Change for |
Stations under construction
The north and south sections are approved for construction. Construction will start in 2021, with estimated completion in 2029.South section
Stations Y01–05 are approved for construction.| Code | English name | Chinese name | Districts | Notes |
| Y01 | 動物園 | Wenshan | Planned as a transfer station for the,, and Shenkeng Light Rail | |
| Y01A | n/a | n/a | Wenshan | |
| Y02A | n/a | n/a | Wenshan | |
| Y03 | n/a | n/a | Wenshan | |
| Y04 | n/a | n/a | Wenshan | |
| Y05 | n/a | n/a | Xindian | To be connected to |
North section
Stations Y19A–29 are approved for construction.| Code | English name | Chinese name | Districts | Notes |
| Y19A | n/a | n/a | Wugu | To be connected to |
| Y19B | n/a | n/a | Wugu | |
| Y20 | n/a | n/a | Luzhou | |
| Y21 | 徐匯中學 | Luzhou | Planned connection to | |
| Y22 | n/a | n/a | Sanchong | Planned connection to Wugu–Taishan Light Rail |
| Y23 | n/a | n/a | Sanchong | |
| Y24 | n/a | n/a | Shilin | |
| Y25 | n/a | n/a | Shilin | Planned connection to Shezi line |
| Y26 | 士林 | Shilin | Planned connection to | |
| Y27 | n/a | n/a | Shilin | |
| Y28 | n/a | n/a | Shilin | |
| Y29 | 劍南路 | Zhongshan | Planned connection to |