Every Operating Rail Line in Seoul Metropolitan Area

The Seoul Metropolitan Area in the northwest of the Republic of Korea, consisting of Seoul Special City, Incheon Metropolitan City, Gyeonggi Province, Cheonan City and Asan City in South Chungcheong Province, and Chuncheon City in Gangwon Province, concentrates more than 50% of the country's population, and is the political, economic and cultural center of Korea. The Seoul Metropolitan Subway is an urban rail transit system serving the Seoul Metropolitan Area, and is the world's largest urban rail transit system in terms of passenger capacity. Try to name as many rail lines as you can!