Gwacheon Line is a metropolitan rail line operated by Korail in Gyeonggi Province, South Korea. All trains is operated as a through service into Seoul Metro's Line 4 and Ansan Line on the other end. 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.

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