수도권 전철
Seoul Metropolitan Subway Line 1 of the Seoul Metropolitan Subway is a rapid transit and commuter rail line which links central Seoul, South Korea to Soyosan Station in the northeast, Incheon in the southwest, and Sinchang via Suwon and Cheonan in the south. The central underground portion of this rail line is the oldest subway section in the Seoul Metropolitan Subway system. Its branches and services cover a large part of the Seoul Capital Area; totaling in route length.