The Toei Asakusa Line is a subway line in Tokyo, Japan, operated by the Tokyo subway operator Toei Subway. The line runs between in Ōta and 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 and the Keikyu Airport Line to. The Keisei Electric Railway operates through trains on the Keisei Oshiage Line to and the Keisei Main Line to, and the Shibayama Railway runs trains via the Keisei Main Line and the Shibayama Railway Line to. 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 actually split into two routes: Oshiage–Sengakuji and Sengakuji–Nishi-magome; only 25% of the trains make all station stops on the line, as most 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.
Services
Local trains operate between Nishi-Magome and Sengakuji approximately every ten minutes and are timed to connect to Keikyu through service trains at Sengakuji.
Rapid service trains operate between Nishi-Magome and Keisei Sakura Station approximately every twenty minutes. They make all station stops on the Asakusa Line.
Limited Express trains operate approximately every twenty minutes and make all stops on the Asakusa Line, providing Limited Express service on the Keikyu line between Sengakuji and. Their northern terminus is usually either Inzai-Makinohara Station or Inba-Nihon-Idai Station on the Hokuso Railway.
Airport Limited Express trains operate approximately every twenty minutes, and skip certain stations while operating on the Asakusa Line. Their northern terminus alternates between "Access Express" service to Narita International Airport and Limited Express service to either Aoto or Takasago. The total travel time from Haneda Airport to Narita Airport on this train is approximately one hour and 46 minutes.
Station list
All stations are located in Tokyo.
The Airport Limited Express/Access Express stops at stations marked "●", skips those marked "|". All other services stop at every station.
Rolling stock
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.
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, 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 and Tokyo Metro Ginza Line connections at Asakusa. Construction of this line began on August 27, 1956 after years of delays, and the initial 3.2 km segment between Oshiage and Asakusabashi opened on December 4, 1960. The line then opened in stages from north to south:
The line was named Asakusa Line on July 1, 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 and Narita Airport in 40 minutes. This plan has yet to be finalized or formally adopted. When Keikyu N1000 series that use SiC-VVVF system entered service, Toei banned those trains running through service due to unknown reasons. But it seems like this ban has cleared, when Keikyu N1000 set 1225F was first seen at Keisei-Takasago Station.
