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From January 15, 1993, to March 31, 1994, the Seoul Metropolitan Subway Line 1 operated like the Ansan Line, and since the opening of all sections on April 1, 1994, it has been operated as a part of the Metropolitan Subway Line 4.
As part of the first new town development in the early 1990s, the Gwacheon Line was built under the leadership of the Korea Railroad Administration (currently Korea Railroad Corporation) for the purpose of connecting Sanbon New Town and Pyeongchon New Town with Gwacheon City and Seoul Metropolitan City. From January 15, 1993, to March 31, 1994, the Seoul Metropolitan Subway Line 1 operated like the Ansan Line, and since the opening of all sections on April 1, 1994, it has been operated as a part of the Metropolitan Subway Line 4.
(2026)
