Toei Ōedo Line
| Ōedo Line | |||
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Toei 12-000 series EMU used on the Ōedo Line at Kiba Inspection Yard
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| Overview | |||
| Type | Heavy rail rapid transit | ||
| Locale | Tokyo | ||
| Termini |
Hikarigaoka |
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| Stations | 38 | ||
| Daily ridership | 878,960 (2014) | ||
| Operation | |||
| Opened | December 10, 1991 (first section) December 12, 2000 (entire line) |
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| Owner | Tokyo Metropolitan Bureau of Transportation (Toei) | ||
| Depot(s) | Kiba | ||
| Rolling stock | Toei 12-000 series | ||
| Technical | |||
| Line length | 40.7 km (25.3 mi) | ||
| Track gauge | 1,435 mm (4 ft 8 1⁄2 in) | ||
| Electrification | 1,500 V DC overhead catenary | ||
| Operating speed | 70 km/h (43 mph) | ||
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The Toei Ōedo Line (都営地下鉄大江戸線 Toei Chikatetsu Ōedo-sen?) 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 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. (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. 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.
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