High Quality Content by WIKIPEDIA articles! The Toei ?edo Line is a subway line in Tokyo, Japan operated by the Tokyo Metropolitan Bureau of Transportation (Toei). It commenced full operations on December 12, 2000; using the Japanese calendar this reads "12/12/12" as the year 2000 equals Heisei 12. The line is completely underground, making it the second-longest railway tunnel in Japan after the Seikan Tunnel. On maps and signboards, the line is shown in "magenta" (O). Stations carry the letter E followed by a two-digit number.The ?edo Line is Tokyo's first linear motor metro line (and the second in Japan after the Nagahori Tsurumi-ryokuchi Line in Osaka), which allows it to use smaller cars and smaller tunnels. These putative cost savings were, however, offset by the need to build the line very deep (as low as 48 meters below ground at points) through central Tokyo, including three underground crossings of the Sumida River.

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