As of June 2018, the entire section from station K1 to K6 is clearly visible on Google Maps running down the middle of Anyi Rd and then turning right onto Anjie Rd, passing through a cemetery and going across Ankang Road.

[4] Stage I construction consists of 14 stations running from New Taipei Industrial Park on Taoyuan Airport MRT to Dapinglin on Songshan–Xindian line and is about 15.4 km (9.6 mi) long.

[5] Electromechanical equipment for the line is supplied by Hitachi Rail STS, including driverless technology and CBTC Radio signalling.

[6] In February 2020, free rides were offered to passengers in order to raise awareness and test the route's popularity.

[12] The Danhai light rail uses its own rolling stock [zh], which entered service in December 2018 with the opening of the first section.

The Hitachi Rail Italy Driverless Metro is used on the Circular line, which entered service in January 2020 with the opening of the first section.

[6] New Taipei Metro also uses a fleet of specialised trains for maintenance of way purposes on the Circular line: The system currently has three depots, with more under construction.

The first section is 14.29 km (8.88 mi) long, has twelve stations and runs through Tucheng, Sanxia and Yingge districts, and should be completed by 2025.

The route extends eastwards from Taipei City Zoo through Shenkeng District, terminating at National Freeway No 5's Shiding service area.