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| Seoul Subway Line 3 | |
|---|---|
| Name | Line 3 |
| Type | Rapid transit |
| System | Seoul Metropolitan Subway |
| Status | Operational |
| Locale | Seoul, Gyeonggi Province |
| Stations | 34 |
| Opened | 1985 |
| Operator | Seoul Metro, Korail |
| Depot | Nowon Depot |
| Linelength | 38.2 km |
| Electrification | 1,500 V DC |
Seoul Subway Line 3 Seoul Subway Line 3 is a rapid transit line in the Seoul Metropolitan Subway network linking northern Nowon and southern Gangnam corridors via central Seoul. The line connects major nodes such as Gyeongbokgung, Express Bus Terminal, and Apgujeong while intersecting with Line 1, Line 2, Line 4, and regional services including Bundang Line and Gyeongbu Line. It serves residential, commercial, and institutional centers across Jongno District, Yongsan District, and Seocho District.
Line 3 operates heavy-rail metro services between Daehwa Station in Goyang (via the Ilsan Line) and Ogeum Station in Songpa District, linking suburban hubs such as Goyang, Ilsan, and Seongbuk District to central Seoul facilities including Seodaemun Prison History Hall and National Museum of Korea. The route provides transfers to inter-city rail at Seoul Station, to airport access via AREX connections, and to bus terminals such as Seoul Express Bus Terminal. Rolling stock is operated by Seoul Metro and Korail, with power supplied by 1,500 V DC overhead lines and depots at Nowon Depot.
Planning for Line 3 formed part of Seoul’s 1970s and 1980s expansion programs alongside Seoul Metropolitan Subway Line 2 and Line 4, developed during administrations led by Chun Doo-hwan and later implemented under leaders like Roh Tae-woo. Initial segments opened in 1985 connecting central nodes near Jongno District and Eunpyeong District, later extended south through Seocho District and east toward Gangnam District. The line’s integration with suburban networks such as the Bundang Line and the Ilsan Line followed policy shifts under the Ministry of Land, Infrastructure and Transport and operational coordination with Korail and Seoul Metro to improve commuter flows to facilities like COEX and Gangnam Station. Subsequent upgrades addressed capacity issues identified after the 1990s boom tied to developments near Yeouido and Jamsil.
The line traverses key stations including Gupabal Station, Eunpyeong-gu Office Station, Jongno 3-ga Station, Anguk Station, Express Bus Terminal, Jamwon Station, Sinsa Station, Apgujeong Station, Sinsa Station, Sadang Station, and Ogeum Station, providing interchange with lines such as Line 1, Line 2, Line 4, Line 5, and regional corridors like Gyeongui–Jungang Line and Gyeongbu Line. Stations serve landmarks including Gyeongbokgung Palace, Sejong Center, Banpo Hangang Park, and National Museum of Korea. The line’s alignment includes underground cut-and-cover sections through dense districts and elevated segments approaching suburban termini like Ilsan.
Rolling stock classes deployed include variants of Korean National Railroad designs and later EMUs produced by manufacturers such as Hyundai Rotem, Daewoo Heavy Industries, and Korea Rolling Stock Corporation. Trains are configured in 8-car formations with longitudinal seating and features influenced by rolling stock used on Line 2 and Line 4, incorporating automated train protection systems standardized across the Seoul network, consistent with procurement overseen by Seoul Metro and Korail. Mid-life refurbishments addressed HVAC, interior layout, and energy-efficiency retrofits similar to programs on Bundang Line and Gyeongui–Jungang Line.
Operations are coordinated between Seoul Metro and Korail with scheduled through-services and peak-direction express patterns mirroring strategies used on Line 1 and Suin–Bundang Line. Service frequency peaks during morning and evening rush hours, with headways reduced to manage flows to employment centers such as Gangnam Station and transfer hubs like Seoul National University Station (via other lines). Signaling upgrades paralleled projects on Line 9 to increase capacity, and punctuality is monitored alongside national standards set by the Ministry of Land, Infrastructure and Transport.
Ridership has been driven by commuter demand from municipalities including Goyang, Seongnam, and Seoul, with station usage concentrated at Express Bus Terminal, Apgujeong, and Jongno 3-ga. Annual ridership figures align with trends observed on Line 2 and Bundang Line, showing peak crowding during office hours correlating with employment concentrations at Yeouido, Gangnam, and COEX. Performance metrics track on-time rates, crowding indices, and safety records per standards applied across agencies like Seoul Metro and Korail and inspected by the Korea Transportation Safety Authority.
Proposed projects include capacity increases, rolling stock renewals, and coordinated extensions to improve connections with suburban projects such as the Ilsan Line and infill station upgrades mirroring initiatives on Line 5 and the Seobu Line concept. Planning involves stakeholders like the Seoul Metropolitan Government and Gyeonggi Provincial Government and considers integration with national initiatives including high-capacity rail corridors exemplified by the Gyeongbu High Speed Railway and regional transit strategy cases like the Metropolitan Rail Expansion Plan. Potential modernization priorities emphasize signaling upgrades similar to those on Line 9 and station accessibility retrofits following precedents at Seoul Station and Incheon Station.
Category:Seoul Metropolitan Subway lines