siding (underground) after Danggogae Station Changdong Depot (used for Seoul Metro class 4000) Connecting track to Line 3 before Chungmuro Station Dongjak Bridge Chongshin Univ. – Sadang scissors crossover Hanyang University, ERICA Campus Turnback siding (underground) after Sadang Station Namtaeryong–Seonbawi track crossing point (flying crossover, switch from right to left-hand traffic, or vice versa) The voltage/current switches between DC 1,500 V ↔ AC 25,000 V Ansan Depot (used for simple maintenance of Korail Class 341000 train) Siheung Depot (used for Korail Class 341000 maintenance and also for heavy maintenance of Korail Class 311000 trains operated on Line 1) The largest scale of shell mounds in the South Korean west coast in Oido Rolling stock Current Seoul Metro Seoul Metro 4000 series 1st generation, DC only: 4-01~4-26 (only allowed between Jinjeop & Sadang) 1st generation, DC & AC: 4-51~4-71 2nd generation: 4-81~4-85 Korail Korail Class 341000 (ex-Korail Class 2030) 1st generation: 341-01~341-25 2nd generation: 341-26~341-30 3rd generation: 341-31~341-37 4th generation: 341-38~341-55 Trains 341-31~341-32 are temporary running on Line 1. Trains 341-38~341-55 are trail running or being manufactured in factories Former Seoul Metro Seoul Metro wide-width GEC chopper resistor controlled electric car (1985–1993; transferred to Seoul Subway Line 3) Korail Korail Class 1000 (Ansan Line only, transferred to Seoul Subway Line 1) See also Subways in South Korea Seoul Metropolitan Subway References Seoul Metropolitan Subway lines Railway lines opened in 1985