Most of the train lines in Tōkyō have names based on whatever major area they originated/terminated – or at least stopped at. For example, the Marunouchi Line’s most important stations were in the former Marunouchi (Daimyō Alley) and the Yamanote Line connected centers of the “new Yamanote.[ii]” Some of the more ambitious, longer train lines have names that describe their start/stop points in general terms. This type of name usually reflects the tendency of the Japanese language to make new matches out of existing kanji.
Most of these names are self-evident to the Japanese, especially people who live and/or work in and around Tōkyō. But many of these names may be slightly mysterious to foreigners.