Seoul Subway Line 2 (), also known as the Circle Line, is a circular line of the Seoul Metropolitan Subway. The line running clockwise is called the "inner circle line" and the counter-clockwise line is called the "outer circle line". This is Seoul's most heavily used line, and consists of the main loop (), the Seongsu Branch () and the Sinjeong Branch () for a total line length of . The Line 2 loop is the third longest subway loop in the world after Moscow Metro Bolshaya Koltsevaya line and Beijing Subway Line 10. In 2019, Line 2 had an annual ridership of 812 million passengers or 2.2 million passengers per day.

Line 2's station signs share their design with the underground station signs on Line 1, but green and with arms pointing to the next and previous stations.

Headways on the line vary from 2 minutes 18 seconds on peak periods[사회]서울 지하철2호선 출근길 배차간격 12초 짧아져. Ytn.co.kr (2010-11-22). Retrieved on 2013-07-12. and 5–6 minutes off-peak periods. The line connects the city centre to Gangnam, Teheran Valley and the COEX/KWTC complex.

History

In 1972, then-Mayor of Seoul (1932–1996) changed the existing plans for the Seoul Subway to better enable connectivity around the growing Seoul City and allow for development to take place across the Seoul Metropolitan Area. Line 2 was built in 1978–84 together with the Seongsu Branch (the second Sinjeong Branch was built 1989–95). Dangsan Railway Bridge was closed for reconstruction in 1996 and reopened November 22, 1999. The old steel girder bridge was replaced by a long concrete bridge between Dangsan on the southern side of the river and Hapjeong on the northern bank. During this period, the inner loop only ran to Dangsan Station, and the outer loop only ran to either Hongik University Station or Hapjeong Station.

Yongdu station on the Seongsu Branch (between Sindap and Sinseol stations) is the first station in the Seoul Subway system with operating platform screen doors. As of 2008 platform screen doors are operating at all stations along Line 2. New rolling stock has also progressively came on line, replacing older vehicles. ● October 31, 1980 Sinseol-dong – Sports Complex (via Seongsu) section opened ● December 23, 1982 Sports Complex – Seoul Nat'l Univ. of Education section opened Euljiro 1-ga – Seongsu section opened; Sinseol-dong – Seongsu section separated as Seongsu Branch ● December 17, 1983 Seoul Nat'l Univ. of Education – Seoul Nat'l University section opened ● May 22, 1984 Seoul Nat'l University – Euljiro 1-ga (via Sindorim) section opened; the Circle Line (the longest in the world at until it was surpassed in 2013) is completed. ● May 22, 1992 Sindorim – Yangcheon-gu Office section opened as Sinjeong Branch ● February 29, 1996 Sinjeongnegeori Station opened as extension of Sinjeong Branch ● March 20, 1996 Kkachisan Station opened as extension of Sinjeong Branch ● October 20, 2005 Yongdu Station opened on the Seongsu Branch ● September 2010 Siemens Mobility ATP/ATO GoA 2 signalling system implemented on newer trains to increase frequencies and route capacity.

Facilities In December 2010 the line is recorded as having the highest WiFi data consumption in the Seoul Metropolitan area. It averaged 2.56 times more than the other 14 subway lines fitted with WiFi service zones.

In 2011, retailer Homeplus opened the world's first virtual supermarket at Seolleung station, where smartphone users can photograph the bar code of life-size pictures of 500 items of food, toiletries, electronics etc. on the walls and platform screen doors, for delivery the same day.

Stations All stations on all branches are in Seoul. Main Line Stationnumber Station name Connections Distance Location City Hall Euljiro 1(il)-ga Euljiro 3(sam)-ga Euljiro 4(sa)-ga Dongdaemun History & Culture Park Sindang Sangwangsimni Wangsimni Hanyang Univ. Ttukseom Seongsu Konkuk Univ. Guui Gangbyeon Jamsillaru Jamsil Jamsilsaenae Sports Complex Samseong (2026) Seolleung Yeoksam Gangnam Seoul National University of Education Seocho Bangbae Sadang Nakseongdae Seoul National University Bongcheon Sillim Sindaebang Guro Digital Complex Daerim Sindorim Mullae Yeongdeungpo-gu Office Dangsan Hapjeong Hongik Univ. Sinchon Ewha Womans Univ. Ahyeon Chungjeongno

Seongsu Branch Stationnumber Station name Connections Distance Location Seongsu Yongdap Sindap Yongdu Sinseol-dong

Sinjeong Branch Stationnumber Station name Connections Distance Location Sindorim Dorimcheon Yangcheon-gu Office Sinjeongnegeori Kkachisan

Extension There is a possible extension currently in the conception stage to extend the Sinjeong Branch to 3.7 km to Gayang Station on Line 9. The path would include a new station named Gangseo-gu Office in between Kkachisan and Gayang.

Rolling stock

Five generations of Seoul Metro 2000 series trains have been used on Seoul Subway Line 2. As of , only third, fourth and fifth batch 2000 series trains are in operation (manufactured by Hyundai Rotem and Dawonsys respectively), since all first (MELCO thyristor chopper control) and second batch (GEC Traction/Alstom thyristor chopper control) trains have been retired between 2008 and 2023. All trains are stored and maintained at Sindap Depot on the Seongsu Branch and Sinjeong Depot on the Sinjeong Branch.

Ridership Seoul Subway Line 2 RidershipYearRidershipChange (%)Remarks2026367,298,520Updated as of June 20262025725,638,897 12024718,870,848 2.52023701,064,000 8.72022644,871,000 12.92021571,437,000 1.12020577,744,000 28.8COVID-19 pandemic2019811,960,000 0.7Highest on record2018806,562,000 0.52017802,358,000 1.22016811,763,000 6.62015761,807,000 1.22014771,242,000 1.62013759,308,000 0.82012752,918,000 0.72011747,578,000 2.12010731,848,000 0.02009732,038,000 0.72008727,057,000 2.82007707,328,000 1.22006699,222,000 0.12005698,776,000 0.72004703,796,000 1.72003692,287,000 0.12002692,766,000 2.42001676,271,000 32000656,567,000 9.21999601,462,000 11998595,320,000 3.91997619,405,000 -

Notes

See also 2014 Seoul subway crash Subways in South Korea Seoul Metropolitan Subway

References

External links Seoul Metro Map, station and route finder