Jisho

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Noun
1. subway; metro; underground (railway)Abbreviation, See also 地下鉄道
Wikipedia definition
2. Rapid transitA rapid transit, underground, subway, elevated railway, metro or metropolitan railway system is an electric passenger railway in an urban area with a high capacity and frequency, and grade separation from other traffic. Rapid transit systems are typically located either in underground tunnels or on elevated rails above street level. Outside urban centers, rapid transit lines may run on grade separated ground level tracks.
Read “Rapid transit” on English Wikipedia
Read “地下鉄” on Japanese Wikipedia
Read “Rapid transit” on DBpedia

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