Seoul Metro Corporation
A municipal railway corporation that operated Seoul Subway Lines 1 through 4 and related Seoul Metropolitan Government-owned infrastructure before merging in 2017.
Last updated August 25, 2026
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Overview
Seoul Metro Corporation was a municipal-owned railway operator established by the Seoul Metropolitan Government in 1970 to develop and operate part of the Seoul metropolitan subway system. Its creation coincided with the formation of the city's subway construction organization and the beginning of work on Seoul Subway Line 1, the first major urban rapid-transit project in the capital. The corporation became the principal operator of the Seoul Metropolitan Subway's early core network. Its operational responsibility centered on the whole of Line 2 and the Seoul Metropolitan Government-owned portions of Lines 1, 3, and 4. On Lines 1, 3, and 4, service was coordinated with Korail because the lines extended beyond the sections directly controlled by Seoul Metro. The company also controlled selected stations or infrastructure associated with other lines, including stations on Lines 5, 6, and 9, although it was not the principal operator of those entire routes. The network expanded in stages. Line 1 entered service in 1974, followed by the opening of Line 2's circular route in 1984 and Lines 3 and 4 in 1985. Subsequent extensions added branches, outer sections, transfer points, and additional stations through the 1990s and 2000s. These projects helped transform the subway from a single initial corridor into a dense metropolitan transport system serving residential districts, business centers, universities, commercial areas, and interchanges with national railway services. Seoul Metro's business was primarily public transportation rather than a conventional consumer brand. Its responsibilities included train operations, station management, railway control, passenger information, maintenance, and the administration of subway assets owned by the Seoul Metropolitan Government. The corporation operated within a broader institutional structure alongside Seoul Metropolitan Rapid Transit Corporation and Korail, with responsibilities divided by line, infrastructure ownership, and service section. On May 31, 2017, Seoul Metro Corporation merged with Seoul Metropolitan Rapid Transit Corporation. The transaction created a new unified Seoul Metro organization responsible for a substantially larger share of the Seoul metropolitan subway network. The original corporation therefore ceased to operate as a separate legal and organizational entity. This entry describes the historical corporation, not the later successor organization that adopted the Seoul Metro name.
History
Seoul Metro Corporation emerged from Seoul's effort to establish a modern urban railway system. The city's subway construction headquarters was established on June 8, 1970, and work on the first section of Line 1 began in April 1971. The corporation's early development was closely connected with the Seoul Metropolitan Government's program to create a high-capacity alternative to increasingly congested road transport. The first Line 1 section, linking Cheongnyangni and Seoul Station, opened in 1974. The corporation then developed the facilities required to support a larger operating network, including the construction of Gunja Depot in 1974. Construction of the Gangnam section of Line 2 began in 1978, while work on Lines 3 and 4 started in 1980. Line 2's circular route opened in 1984, and Lines 3 and 4 entered service in 1985. These openings established the central network around which Seoul's later metropolitan subway system grew. Expansion continued through branch lines and extensions. Line 3 was extended from Gupabal to Jichuk in 1990 and later from Yangjae to Suseo in 1993. The Sinjeong Branch of Line 2 opened in stages in 1992 and 1996. Line 4 was extended to Danggogae in 1993 and to Namtaeryeong in 1994. Further station additions included Yongdu on Line 2 in 2005 and Dongmyo on Line 1 later that year. Line 3 reached Ogeum in 2010, completing another important eastward extension. Operationally, Seoul Metro was not the sole institution responsible for every service branded as part of the Seoul Metropolitan Subway. It shared Line 1, Line 3, and Line 4 operations with Korail, with Seoul Metro controlling the sections and stations owned by the Seoul Metropolitan Government. Seoul Metropolitan Rapid Transit Corporation operated other major routes and also controlled selected stations or sections that intersected with Seoul Metro's network. This division reflected the ownership and administrative structure of the metropolitan railway system. The corporation's principal assets and services were Lines 1 through 4, including Line 2's circular route and its Seongsu and Sinjeong branches. It also controlled selected infrastructure associated with Lines 5, 6, and 9. Its work covered train dispatching, station operations, passenger service, infrastructure management, maintenance, and coordination with other railway operators. As a municipal corporation, it served public policy goals such as network integration, accessibility, and dependable daily transportation rather than operating as a profit-maximizing private railway company. A major institutional change came on May 31, 2017, when Seoul Metro Corporation merged with Seoul Metropolitan Rapid Transit Corporation. The merger produced a new unified Seoul Metro entity with responsibility for a wider portion of the metropolitan subway system. The historical corporation consequently became defunct as a standalone organization, while its lines, facilities, employees, and operating functions were absorbed into the successor structure.
- 2017
Merger created the new Seoul Metro
[1]Seoul Metro Corporation merged with Seoul Metropolitan Rapid Transit Corporation on May 31, ending the predecessor corporation's independent existence.
- 2015
Line 9 section listed under Seoul Metro control
[1]The Eonju–Sports Complex section of Line 9 opened on March 28 and was identified in the reference material as infrastructure controlled by Seoul Metro.
- 2010
Line 3 extended to Ogeum
[1]The Suseo–Ogeum section opened on February 18, extending Line 3 farther east.
- 2005
Yongdu and Dongmyo stations opened
[1]Yongdu Station on Line 2 opened in October, followed by Dongmyo Station on Line 1 in December.
- 1996
Sinjeong Branch extended to Kkachisan
[1]The Sinjeongnegeori–Kkachisan section of Line 2's branch opened on March 20.
- 1994
Line 4 reached Namtaeryeong
[1]The Sadang–Namtaeryeong section of Line 4 opened on April 1.
- 1993
Major Line 3 and Line 4 extensions opened
[1]Line 4 reached Danggogae in April, and Line 3 was extended from Yangjae to Suseo in October.
- 1992
Sinjeong Branch opened in stages
[1]The first section of Line 2's Sinjeong Branch, between Sindorim and Yangcheon-gu Office, opened on May 22.
- 1990
Line 3 extended to Jichuk
[1]The Gupabal–Jichuk section of Line 3 opened on July 13.
- 1985
Lines 3 and 4 opened
[1]Lines 3 and 4 opened on October 18, substantially extending the city's rapid-transit coverage.
Products and positioning
A publicly owned metropolitan rail operator focused on reliable, high-volume urban mobility and the operation of Seoul Metropolitan Government-controlled subway assets.
Urban rail line · 1974
Line 1
Seoul Metro operated the Seoul Metropolitan Government-controlled portion of Line 1 between Cheongnyangni and Seoul Station, while the broader service extended beyond that section through coordination with Korail. The initial section opened in 1974 and formed the first operational foundation of the metropolitan subway system.
Urban rail line · 1984
Line 2
Line 2 was Seoul Metro's principal complete route. Its main circular line connects major central and southern Seoul districts, while the Seongsu and Sinjeong branches extend the network into additional residential and commercial areas. The circular route opened in 1984, with branch extensions following in the 1990s and later station additions.
Urban rail line · 1985
Line 3
Seoul Metro controlled the Seoul Metropolitan Government-owned portion of Line 3, from Jichuk toward Ogeum, while the full operating service extended farther west in coordination with other operators. The line opened in 1985 and was expanded through extensions to Jichuk, Suseo, and Ogeum.
Urban rail line · 1985
Line 4
Seoul Metro controlled the municipal section of Line 4 between Danggogae and Namtaeryeong. The line opened in 1985 and was extended during the 1990s. Its wider service operated in coordination with Korail beyond the section directly managed by the municipal corporation.
Railway infrastructure control
Selected stations and infrastructure on Lines 5, 6, and 9
In addition to its principal Lines 1 through 4 responsibilities, Seoul Metro controlled selected stations or infrastructure associated with Lines 5, 6, and 9. These assignments did not make the corporation the full-system operator of those lines, but reflected the divided ownership and operating arrangements of Seoul's metropolitan railway network.
Brand decisions
2017
Consolidation with Seoul Metropolitan Rapid Transit CorporationM&ABackground
Seoul's subway system was operated by multiple municipal and national railway organizations, including Seoul Metro Corporation, Seoul Metropolitan Rapid Transit Corporation, and Korail. The city pursued institutional consolidation to bring major municipal subway operations under a unified organization.
Action taken
Seoul Metro Corporation merged with Seoul Metropolitan Rapid Transit Corporation on May 31, 2017, forming a new Seoul Metro organization.
Aftermath
The predecessor corporation ceased to exist as a separate entity, while its network responsibilities and operating functions moved into the successor Seoul Metro.
Sources1 sources
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