Suin Line extension opens in Incheon February 29, 2016 | Asia Pacific News The national railroad operator in South Korea, Korail, has commenced service on the 7.3-km northwest extension of the Suin (Suwon-Incheon) commuter rail line in Incheon. The extension spans 7.3 km and... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password