|Toei Asakusa Line|
|Color on map|
|Daily ridership||718,855 (FY2016)|
|Opened||4 December 1960|
|Line length||18.3 km (11.4 mi)|
|Track gauge||1,435 mm (4 ft 8+1⁄2 in) standard gauge|
|Minimum radius||161 m (528 ft)|
|Electrification||1,500 V DC (overhead catenary)|
|Operating speed||70 km/h (43 mph)|
|Signalling||Automatic closed block|
|Train protection system||C-ATS|
The Toei Asakusa Line (都営地下鉄浅草線, Toei Chikatetsu Asakusa-sen) is a subway line in Tokyo, Japan, operated by the municipal subway operator Toei Subway. The line runs between Nishi-magome in Ōta and Oshiage in Sumida. The line is named after the Asakusa district, a cultural center of Tokyo, under which it passes.
The Asakusa Line was the first subway line in Japan to offer through services with a private railway. Today, it has more through services to other lines than any other subway line in Tokyo. Keikyu operates through trains on the Keikyu Main Line to Misakiguchi and the Keikyu Airport Line to Haneda Airport Domestic Terminal. The Keisei Electric Railway operates through trains on the Keisei Oshiage Line to Inba-Nihon-Idai and the Keisei Main Line to Narita Airport Terminal 1, and the Shibayama Railway runs trains via the Keisei Main Line and the Shibayama Railway Line to Shibayama-Chiyoda. Via its through services with Keisei and Keikyu, the Asakusa line is the only train line that offers a direct connection between Tokyo's two main airports.
The Asakusa Line is often split into two routes: Oshiage–Sengakuji and Sengakuji–Nishi-magome; only some trains make all station stops on the line, as many trains travel on the Keikyu Main Line south of Sengakuji.
On maps and signboards, the line is shown in the color rose. Stations carry the letter "A" followed by a two-digit number inside a more reddish vermilion circle.
|No.||Station||Japanese||Distance (km)||Airport Ltd. Exp./Access Exp.||Transfers||Location|
|Nishi-magome||西馬込||–||0.0||Keikyu Main Line
Through to Keikyu Airport Line
|Nakanobu||中延||0.9||2.1||Ōimachi Line (OM04)||Shinagawa|
|Togoshi||戸越||1.1||3.2||Ikegami Line (Togoshi-ginza Station: IK03)|
|Keikyu through services:||To/from Haneda Airport Terminal 1·2 via the Keikyū Main Line and Keikyū Airport Line|
From Zushi·Hayama via the Keikyū Zushi Line (northbound only)
From Uraga via the Keikyū Main Line (northbound only; southbound trains for Keikyū Kurihama Line via Horinouchi)
To/from Misakiguchi via the Keikyū Main Line and Keikyū Kurihama Line
|Higashi-ginza||東銀座||0.9||11.4||｜||Hibiya Line (H-10)
Underground passage to Ginza, Hibiya and Yūrakuchō stations
|Asakusabashi||浅草橋||0.7||15.2||｜||Chūō-Sōbu Line (JB20)||Taitō|
|Kuramae||蔵前||0.7||15.9||｜||Ōedo Line (E-11)|
|Through Services via the Keisei Oshiage Line||To/from Narita Airport Terminal 1 via the Keisei Main Line|
To/from Narita Airport Terminal 1 via the Keisei Main Line and Narita Sky Access Line
To/from Imba-Nihon-Idai via the Keisei Main Line and Hokusō Line
To/from Shibayama-Chiyoda via the Keisei Main Line, Keisei Higashi-Narita Line, and Shibayama Railway
A variety of rolling stock is in use due to the large number of through service operators on the line, all of which use standard gauge tracks and 1,500 V DC electrification via overhead lines. Currently, six operators run trains onto the Asakusa Line, the most of any Tokyo subway line, and the line is unique as the only subway line in Tokyo with through services onto standard gauge railways (all other through services are with narrow gauge lines).
The Toei Asakusa Line was the first subway line constructed by the Tokyo Metropolitan Government. The line number is Line 1, because it was technically the first subway line in Tokyo to be planned in the 1920s as an underground route connecting the Keikyu and Keisei Electric Railway via Shinagawa, eventually allowing for through trains between these two railways. In its original plan form, the line would have actually bypassed Asakusa Station entirely. However, the plan was changed to take advantage of the existing Tobu Isesaki Line (section now named as the Tobu Skytree Line) and Tokyo Metro Ginza Line connections at Asakusa.
Construction of this line began on 27 August 1956 after years of delays, and the initial 3.2 km (2.0 mi) segment between Oshiage and Asakusabashi opened on 4 December 1960. The line then opened in stages from north to south:
The line was named Asakusa Line on 1 July 1978.
From 1998 to 2002, the Asakusa Line was used as part of a rail connection between Tokyo's two major airports, Haneda and Narita. While a few trains still run between the airports, the service has greatly diminished in frequency since 2002.
In 2005, a research group of government, metropolitan and railway company officials proposed that the Asakusa Line be connected to Tokyo Station via a spur to the north of Takarachō Station. This would provide Tokyo Station's first direct connection to the Toei subway network. It would also make it possible to reach Haneda Airport in 25 minutes (versus 35 minutes today) and Narita Airport in 40 minutes (versus 57 minutes today). This plan has yet to be finalized or formally adopted. Authorities are re-considering a similar plan as part of the infrastructure improvements for the 2020 Summer Olympics; the proposed line would cut travel time to Haneda from 30 minutes to 18 minutes, and to Narita from 55 minutes to 36 minutes, at a total cost of around 400 billion yen.