box between Deokye and Yangju Stations Chang-dong Depot (shared with Line 4) Seongbuk Depot Imun Depot Guro Depot Siheung Depot (actually after Oido Station on Line 4, also used for heavy maintenance of Line 1 trains owned by Korail, accessed by a crossover located after Geumjeong Station) Byeongjeom Depot See also Subways in South Korea Seoul Metropolitan Subway S-train References External links Map, station and route finder UrbanRail.Net Seoul Metropolitan Subway lines Railway lines opened in 1974 1500 V DC railway electrification 25 kV AC railway electrification