It is a fully underground[1] 11.4 km (7.1 mi) Light Rapid Transit line from Ui-dong to Sinseol-dong in northern Seoul which opened on September 2, 2017.

[5] The line uses a dedicated fleet of 18 trains built by Rotem, a member of Hyundai Motor Group.

The trains are very similar, possibly identical, to the ones previously built for the Busan–Gimhae Light Rail Transit.

Each train consists of single 2-section unit with a Jacobs bogie in the center, similar to many street running high floor light rail vehicles such as the light rail rolling stock of Los Angeles, although it is powered by a bottom contact third rail as opposed to overhead wires most street railways use, making them more similar to the first three generations of Docklands Light Railway rolling stock in London.

(서경대) (국민대) (돈암) The Seoul Metropolitan Government plans to open an extension for the Ui Sinseol Line.