The Gimpo Gold Line connects with Seoul Metro lines 5 and 9 as well as the Arex rail link to Seoul Station and Incheon International Airportl

The Gold Line has 10 stations, all of which apart from Yangchon are underground. It is operated by a fleet of two-car driverless trains supplied by Hyundai Rotem. Each 28m-long train is 2.65m wide. Trains will operate at three-minute headways during peak periods reducing to a six-12-minute frequency off-peak with an end-to-end journey time of 30 minutes.

The project was approved in 2012 and construction started in 2014. The total cost was Won 1.65 trillion ($US 1.38bn), with Korea Land and Housing Corporation funding Won 1.2 trillion while the City of Gimpo made up the difference.