High Quality Content by WIKIPEDIA articles! The Suin Line (Suwon-Incheon) is a commuter subway line of Korail. Formerly a narrow-gauge railway in South Korea, it connected Suwon (Gyeongbu Line) to Namincheon via Ansan and Siheung, and was abandoned in 1995. However, the Suin Line is currently being reconstructed in standard gauge and double track as an integral part of the Seoul Metropolitan Subway network and will open in three phases. Phase 1 opened on June 30, 2012 from Oido Station to Songdo station, Phase 2 will open in 2014 as an extension from Songdo station to Incheon station and on December 2015, Phase 3 will open between Suwon station and Hanyang Univ. at Ansan station, and will merge with the Bundang Line.