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The is a part of the extensive rapid transit system that consists of Tokyo Metro and Toei Subway in the Greater Tokyo area of Japan. While the subway system itself is largely within the city center, the lines extend far out via extensive through services onto suburban railway lines. ==Networks== There are two primary subway operators in Tokyo: * Tokyo Metro – Formerly the Teito Rapid Transit Authority (TRTA), it was privatized in 2004. It currently operates 179 stations on nine lines and of route. * Toei Subway – run by the Tokyo Metropolitan Bureau of Transportation, an agency of the Tokyo Metropolitan Government. It operates 106 stations on four lines. As of 2013, the combined subway network of the Tokyo and Toei metros comprises 290 stations and 13 lines. The Tokyo Metro and Toei networks together carry a combined average of over eight million passengers daily.〔 〕 Despite being ranked first in worldwide subway usage, subways make up a small fraction of heavy rail rapid transit in Tokyo alone—only 274 out of 882 railway stations, as of 2007.〔(【引用サイトリンク】script-title=ja:【平成19年版】緯度経度付き全国沿線別駅データ - 地図センターネットショッピング )〕 The Tokyo subway at 8.7 million daily passengers only represents 22% of Tokyo's 40 million daily rail passengers (see Transport in Greater Tokyo).〔http://www.mlit.go.jp/kisha/kisha07/01/010330_3/01.pdf〕 In addition, but not formally designated as subways: * The Tokyo Waterfront Area Rapid Transit (TWR) operates a single mostly-underground line with eight stations, and 200,200 daily passengers in 2010 〔http://www.twr.co.jp/enterprise/gaiyou_h22_final_outline.pdf〕 * The Saitama Rapid Railway Line, which is essentially an extension of the Tokyo Metro Namboku Line, operates a single mostly-underground line with eight stations. * The Yamanote Line is not a subway line, but an above-ground commuter loop line which operates with metro-like frequencies. It is owned by JR East. It acts as a key transportation artery in central Tokyo, and is often marked on Tokyo subway maps. The Yokohama Subway, (and the planned Kawasaki Subway) also operate in the Greater Tokyo Area, but they are not directly linked to the Tokyo subway network. However, on special occasions (typically holiday weekends), the Tokyo Metro Hibiya Line and Namboku Line operate special direct through services onto Yokohama's Minatomirai Line via the Tōkyū Tōyoko Line railway. 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「Tokyo subway」の詳細全文を読む スポンサード リンク
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