Suin Line

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The Suin Line, also called Suinseon, is a rapid transit line in the Seoul Metropolitan Subway that runs from Suwon to Incheon, with 27 stations (8 shared with the Ansan Line). It is operated by Korail and forms part of the Seoul Metropolitan Subway network.

History and status
The original Suin Line opened in 1937 as a narrow-gauge railway (762 mm) built by the Chosen Gyeongdong Railway, connecting Suwon to Namincheon via Ansan and Siheung. It was taken over by the Chosen Railway in 1942 and later nationalized after 1945. The old route was closed in 1995.

Rebuilding and current operation
Starting in 2004, the Suin Line was rebuilt with standard gauge and double tracking as part of the Seoul Metropolitan Subway. The new line opened in three phases: Phase 1 on June 30, 2012; Phase 2 on February 27, 2016; and Phase 3 on September 12, 2020 (new route). The line is 39.2 km long, with two tracks. Northbound trains run to Incheon, while southbound trains terminate at Oido. Express services cover key stops near Incheon. Stations were built to accommodate 8-car trains, with planning for 10-car trains when the Bundang and Suin lines are merged.

Rolling stock and design
The Suin Line used 18 Korail Class 351000 trains, similar to Bundang Line stock but originally painted red. They have since been repainted yellow to match Bundang Line colors in anticipation of the Suin–Bundang Line merger. In the past, the line also used narrow-gauge KNR160 diesel cars and KNR18000 passenger cars; one KNR160 car and two KNR18000 cars are preserved at a museum in Uiwang.

Future developments
Hagik Station was planned to open between Songdo and Inha University. There have also been discussions about a Suwon connection that would allow KTX trains to travel between the Gyeongbu high-speed line and Incheon via the Suin–Bundang Line, potentially by 2025.