According to the authors, each city's various subway structures and railway systems should reflect somehow the character of that city. In an effort to infuse the city's identity into its subway map, while also trying to simplify and beautify the original diagram, Kim Ji-Hwan and Jin Sol produced a series of original maps for three city subway systems - the Seoul Railway, Tokyo Railway and Osaka Railway. More cities are in the design phase and others are being planned.
City railway system
