Seoul Subway Line 4 (dubbed The Light Blue Line) of the Seoul Metropolitan Subway is a long line crossing from the southwest to the northeast across the Seoul National Capital Area. The central section in Seoul City is operated by Seoul Metro with some trains offering through service to Korail's Ansan and Gwacheon Lines. The southern terminus (Oido) is in Jeongwang 4-dong, Siheung City, and the northern terminus (Jinjeop) is in Jinjeop-eup, Namyangju-si, Gyeonggi-do; the newly built northern section (officially called the Jinjeop Line) is correspondingly owned by a company owned by Namyangju-si, with operations contracted to Seoul Metro. In 2022, the Seoul Metro operated section (excluding the Jinjeop Line) had an annual ridership of 219,587,000 or about 601,608 passengers per day. Express train service stops at all stations between Danggogae and Sanbon, then at Sangnoksu, Jungang, Choji, Ansan, Jeongwang, and Oido. The express service only operates during rush hours on weekdays.

History

1985: 1993: 1994: 2000: 2003 2010 2014 2017 2020 2022:

Future

Express services are planned to start skipping various stations north of Sanbon station by 2023 to cut travel times.

Stations

Depots, junctions, and points of interest

(from Jinjeop to Oido)

Rolling stock

Current

Seoul Metro

Korail

Former

Seoul Metro

Korail