The Circular or Yellow line (code Y) (Chinese: 環狀線) is a metro line operated by Taipei Metro. The first phase of the project consists of the section from Dapinglin to New Taipei Industrial Park and is approximately 15.4 km (9.6 mi) long with 14 stations. This initial section was opened on 31 January 2020. Hitachi Rail Italy supplied 17 sets of 4-car driverless medium-capacity trains for the line.