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The 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. ==Overview== The Ōedo 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. The line is deep (as low as 48 meters below ground at points) through central Tokyo, including three underground crossings of the Sumida River. Originally budgeted at ¥682.6 billion and 6 years, the construction ended up taking nearly 10 years and estimates of the final cost of construction range from the official ¥988.6 billion to over ¥1,400 billion yen, making it the most expensive subway line ever built.〔(都営12号線（大江戸線）環状部事業の評価（総括表） ), Toei〕 (Yokohama's Minato Mirai Line, however, was even costlier if measured per kilometer.) Ridership projections originally estimated 1 million users daily, a figure scaled down to 820,000 before opening. At the end of 2006, the line was averaging 720,000 passengers/day.〔(各駅乗降人員一覧 ｜ 東京都交通局 )〕 However, its ridership has increased by about five percent each year since its opening, following new commercial and residential development around major stations such as Roppongi and Shiodome. According to the Tokyo Metropolitan Bureau of Transportation, as of June 2009 the Ōedo Line was the fourth most crowded subway line in Tokyo, at its peak running at 178% capacity between Monzen-Nakachō and Tsukishima stations.〔''Metropolis'', ("Commute", June 12, 2009, p. 07. ) Capacity is defined as all passengers having a seat or a strap or door railing to hold on to.〕 There are plans to extend the Ōedo Line westward from its current western terminus at Hikarigaoka Station through to a new terminus in Ōizumigakuenchō, 1.5 km north of Ōizumi-gakuen Station (on the Seibu Ikebukuro Line) then later towards Higashi-Tokorozawa Station (on the Musashino Line). Construction of the first segment to Ōizumigakuenchō is tentatively scheduled for before 2015, and will include the construction of three new stations, temporarily named Doshida station, Ōizumichō station and Ōizumigakuenchō station. Following the awarding of the 2020 Summer Olympics to Tokyo, there has been speculation regarding the addition of another 2.7 km to the proposed extension in order to extend the line to Niiza where the shooting range for the Olympics is to be located. A decision regarding this matter is expected in 2015. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Toei Ōedo Line」の詳細全文を読む スポンサード リンク
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