each side of the panel that display the current time, arrival of the next two trains, at what door to transfer, (if at a transfer station) and the train's locations. The second screen displays advertisements, weather, and news. Regular panels without television screens attached to them serve as guides for exits, surrounding landmarks and exit locations and where the train will lead them to. See also Seoul Metropolitan Subway Korail, operator of lines 1, 3, 4, and most other lines Seoul Metro Corporation (once called SMSC), operator of lines 1-4 Transportation in South Korea References External links Seoul Metro - official site (in English) Subway information (Korea Tourism Organization, in English) SMRT Official website (archive.org snapshot) Seoul City website - Transport (archive.org snapshot) Seoul Metropolitan Subway Rail transport in Seoul Railway companies of South Korea Transport operators of South Korea Railway companies established in 1994 Railway companies disestablished in 2017 Companies based in Seoul 1994 establishments in South Korea 2017 disestablishments in South Korea