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Inside, the cabin layout prioritizes capacity and passenger flow, with longitudinal bench seating covered in patterned orange upholstery and overhead digital route displays in both Japanese and English. The Marunouchi Line operates on a 1,500 V DC overhead catenary and runs entirely underground except for a brief surface section near Nakano-Sakaue, connecting Ikebukuro to Ogikubo over a 24.2-kilometer route that handles hundreds of thousands of passengers daily.


This structure’s sleek metallic architecture and tiered design reflect Japan’s approach to maximizing space efficiency in high-density transport corridors. The network below includes the JR Yamanote Line, Tokyo Metro Ginza Line, and the Toei Asakusa Line, making Shimbashi one of the most vertically integrated transit hubs in Japan.