Seoul Metro Corporation

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.

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.

1. 2017Merger created the new Seoul Metro

   Seoul Metro Corporation merged with Seoul Metropolitan Rapid Transit Corporation on May 31, ending the predecessor corporation's independent existence.

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2. 2015Line 9 section listed under Seoul Metro control

   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.

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3. 2010Line 3 extended to Ogeum

   The Suseo–Ogeum section opened on February 18, extending Line 3 farther east.

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4. 2005Yongdu and Dongmyo stations opened

   Yongdu Station on Line 2 opened in October, followed by Dongmyo Station on Line 1 in December.

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5. 1996Sinjeong Branch extended to Kkachisan

   The Sinjeongnegeori–Kkachisan section of Line 2's branch opened on March 20.

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6. 1994Line 4 reached Namtaeryeong

   The Sadang–Namtaeryeong section of Line 4 opened on April 1.

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7. 1993Major Line 3 and Line 4 extensions opened

   Line 4 reached Danggogae in April, and Line 3 was extended from Yangjae to Suseo in October.

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8. 1992Sinjeong Branch opened in stages

   The first section of Line 2's Sinjeong Branch, between Sindorim and Yangcheon-gu Office, opened on May 22.

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9. 1990Line 3 extended to Jichuk

   The Gupabal–Jichuk section of Line 3 opened on July 13.

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10. 1985Lines 3 and 4 opened

    Lines 3 and 4 opened on October 18, substantially extending the city's rapid-transit coverage.

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11. 1984Line 2 circular route opened

    The main circular route of Line 2 opened on May 22, creating a major orbital connection through central Seoul, Gangnam, and other high-demand districts.

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12. 1980Construction of Lines 3 and 4 began

    Work began on Lines 3 and 4, expanding the system beyond its initial Line 1 and Line 2 development.

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13. 1978Construction of Line 2's Gangnam section began

    Construction started on the Gangnam section of Line 2, a route that later became Seoul's central circular subway line.

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14. 1974Line 1 opened

    The first Line 1 section entered service, establishing the foundation of Seoul's modern subway network.

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15. 1974Gunja Depot construction

    Construction of Gunja Depot supported the fleet and maintenance requirements of the expanding subway system.

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16. 1971Construction of Line 1 began

    Work began on the initial Cheongnyangni–Seoul Station section of Seoul Subway Line 1 in April.

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17. 1970Subway construction headquarters established

    Seoul established the subway construction headquarters on June 8, marking the institutional beginning of the organization that developed into Seoul Metro Corporation.

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A publicly owned metropolitan rail operator focused on reliable, high-volume urban mobility and the operation of Seoul Metropolitan Government-controlled subway assets.

• Line 1Urban rail line1974

  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.

• Line 2Urban rail line1984

  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.

• Line 3Urban rail line1985

  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.

• Line 4Urban rail line1985

  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.

• Selected stations and infrastructure on Lines 5, 6, and 9Railway infrastructure control

  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.

• 2017Consolidation with Seoul Metropolitan Rapid Transit CorporationM&A

  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.

  What changed. 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.

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• 2017Seoul Metro Corporation merged with Seoul Metropolitan Rapid Transit Corporation

  Seoul Metro Corporation and Seoul Metropolitan Rapid Transit Corporation were consolidated on May 31, 2017, creating a unified Seoul Metro organization and ending the predecessor corporation's separate existence.

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1. Seoul Metro Corporation