:Tokyo Metro Marunouchi Line

The Marunouchi Line is the second line to be built in the city, and the first one constructed after the Second World War. The route is U-shaped, running from Ogikubo Station in the west of the city via the commercial and administrative district of Shinjuku through to the Marunouchi commercial center around Tokyo Station, before turning back and heading to Ikebukuro. Along with the Ginza Line, it is self-enclosed and does not have any through services with other railway lines.

The Marunouchi Line is served by Tokyo Metro 02 series rolling stock in six-car trains on the main line, and mostly three-car trains on the Hōnanchō branch (some six-car trains during peak hours). The main line was the most frequent subway line in Tokyo, with trains once running at intervals of 1 minute 50 seconds during peak hours. In spite of such high-frequency service, according to the 2018 survey by the Ministry of Land, Infrastructure, Transport and Tourism, the Marunouchi Line is one of the most crowded railway lines in Tokyo, [https://www.mlit.go.jp/common/001299797.pdf] {{Webarchive|url=https://web.archive.org/web/20200929163854/https://www.mlit.go.jp/common/001299797.pdf|date=2020-09-29}} running at 169% capacity between Shin-ōtsuka and Myōgadani stations.{{Cite web |url=http://www.mlit.go.jp/common/000047191.pdf |title=Archived copy |access-date=2009-09-11 |archive-date=2009-08-15 |archive-url=https://web.archive.org/web/20090815180637/http://www.mlit.go.jp/common/000047191.pdf |url-status=dead }} Its age and relatively short train length has made it one of the most crowded lines in Tokyo, although the 2000 opening of the Toei Ōedo Line has relieved the problem somewhat. In response to crowding, Tokyo Metro upgraded all stations with chest-high platform doors on March 28, 2009, a date on which it also began driver-only operation. The Hōnanchō branch switched to driver-only operation in July 2004.Tetsudo.com News: [http://www.tetsudo.com/news/309/%E4%B8%B8%E3%83%8E%E5%86%85%E7%B7%9A%E5%85%A8%E7%B7%9A%E3%81%A7%E3%83%AF%E3%83%B3%E3%83%9E%E3%83%B3%E9%81%8B%E8%BB%A2%E9%96%8B%E5%A7%8B%E3%80%8028%E6%97%A5%E3%81%8B%E3%82%89/ 丸ノ内線全線でワンマン運転開始　28日から (17 March 2009)]. Retrieved on 17 March 2009. {{in lang|ja}}

Due to the age of the Marunouchi Line and the relative shallowness at which it runs, at several points in central Tokyo trains run at or above ground level. These include Yotsuya Station, the Kanda River near Ochanomizu Station, and between Kōrakuen and Myōgadani stations.

On maps, diagrams and signboards, the line is shown using the color red. Its stations are given numbers using the prefix "M"; Hōnanchō branch line stations carry the prefix "Mb", which replaced the previously used lowercase "m" prefix in November 2016.[http://www.tokyometro.jp/news/2016/157481.html 丸ノ内線 方南町〜中野新橋駅間の駅ナンバリングを 訪日外国人旅行者の利便性向上のため、2016年11月から順次変更します]

• All stations are located in Tokyo.
• Some trains leave the main line at Nakano-sakaue (M-06) for the Marunouchi Branch Line to Hōnanchō.

File:TokyoMetroMarunouchi.png

File:Tokyo metro map marunouchi.png

File:Tokyo-Metro-Series02.jpg

Marunouchi Line services are operated using a fleet of 53 Tokyo Metro 02 series six-car EMUs in service since 1988 together with six three-car sets used on Hōnanchō branch services until September 2022. All trains are based at Koishikawa and Nakano Depots.{{cite book |script-title=ja: 私鉄車両編成表 2016 |trans-title= Private Railway Rolling Stock Formations – 2016 |publisher = Kotsu Shimbunsha |date = 25 July 2016 |location = Japan |language = ja |page = 69|isbn = 978-4-330-70116-5}}

A fleet of 53 new Tokyo Metro 2000 series six-car trains was scheduled to be introduced from fiscal 2018, replacing the 02 series trains by fiscal 2025.{{cite magazine|script-title=ja: 大手民鉄 2016年度の車両の新造・更新予定|trans-title= Major private railway fiscal 2016 rolling stock construction and refurbishment plans|magazine = Tetsudo Daiya Joho Magazine |volume = 45|issue = 389 |page = 70 |publisher = Kotsu Shimbun |location = Japan |language= ja |date = September 2016}}

On February 23, 2019, the 2000 series started operation.

• TRTA 500 series/TRTA 300/TRTA 400 series/TRTA 500 series/TRTA 900 series (from 1954 until 1996, later sold and exported for use on Line B of the Buenos Aires Underground)
• TRTA 100 series (from 1962 until 1968, transferred from Ginza Line, used for Hōnanchō branch only)
• TRTA 2000 series (from 1968 until 1993, used for Hōnanchō branch only)

File:TRTA Marunouchi Line 2000 Nakano-sakaue 19770625.jpg|A Hōnanchō branch 2000 series train in 1977

{{More citations needed section|date=May 2022}}

File:Marunouchi line-opening1954.jpg

The Marunouchi Line is the second subway line to be built in the city, and the first to be constructed after the Second World War. Its design is similar to that of the Ginza Line, the oldest subway line in Tokyo. Both lines are standard gauge and use third rail power, unlike subsequent Tokyo subway lines which use overhead wires and are mostly narrow gauge to accommodate through services with other railway lines.

In a 1925 plan for a five-line subway system, the Marunouchi Line was planned to run from Shinjuku to Ōtsuka via Hibiya, Tsukiji and Okachimachi, as a {{convert|20|km|mi|abbr=on}} underground route. A {{convert|1.2|km|mi|abbr=on}} segment between Akasaka-mitsuke and Yotsuya began construction in 1942, but was abandoned in 1944 as a result of the continuing effects of World War II. On December 7, 1946, the Marunouchi Line was revised to begin from Nakano-fujimichō to the Mukōhara neighbourhood in Toshima Ward via Kanda and Ikebukuro, for a total length of {{convert|22.1|km|mi|abbr=on}}. On March 30, 1951, a groundbreaking ceremony was held at Ikebukuro Station East Exit to begin construction of the initial {{convert|7.7|km|mi|abbr=on}} segment of the Marunouchi Line.

The first section was opened between Ikebukuro and Ochanomizu on January 20, 1954.{{Cite web |title=History |url=https://www.tokyometro.jp/lang_en/corporate/profile/history/index.html |archive-url=https://web.archive.org/web/20230605063443/https://www.tokyometro.jp/lang_en/corporate/profile/history/index.html |archive-date=2023-06-05 |access-date=2024-07-13 |website=tokyometro.jp}} The subsequent progress of the line was as follows:

• Ochanomizu to Awajichō: March 1956
• Awajichō to Tokyo: July 1956
• Tokyo to Nishi-Ginza (now Ginza): December 1957
• Nishi-Ginza to Kasumigaseki: October 1958
• Kasumigaseki to Shinjuku: March 1959
• Shinjuku to Shin-Nakano/Nakano-Fujimichō (not Nishi-Shinjuku): February 1961
• Shin-Nakano to Minami-Asagaya (not Higashi-Kōenji): November 1961
• Minami-Asagaya to Ogikubo: January 23, 1962
• Nakano-Fujimichō to Hōnanchō: March 23, 1962
• Nishi-Ginza becomes part of Ginza when Hibiya Line reaches there: August 1964
• Higashi-Kōenji opens (between Shin-Nakano and Shin-Kōenji): September 1964
• Nishi-Shinjuku opens (between Shinjuku and Nakano-Sakaue) May 1996.

The Marunouchi Line was one of the lines targeted in the Aum sarin gas attack on March 20, 1995. A plan to extend the Marunouchi Line from Ogikubo to Asaka City in Saitama Prefecture was rejected in the late 1990s.

The line, stations, rolling stock, and related facilities were inherited by Tokyo Metro after the privatization of the Teito Rapid Transit Authority (TRTA) in 2004.{{Cite web |date=2006-07-08 |title=「営団地下鉄」から「東京メトロ」へ |trans-title=From "Teito Rapid Transit Authority" to "Tokyo Metro" |url=https://www.tokyometro.jp/news/s2004/2004-06.html |url-status=dead |archive-url=https://web.archive.org/web/20120516041232/http://www.tokyometro.jp/news/s2004/2004-06.html |archive-date=16 May 2012 |access-date=29 May 2022 |website=Tokyo Metro Online}}

Automatic train control (ATC) was activated on the Marunouchi Line on February 27, 1998, which allowed for an increase in the maximum operating speed limit from {{convert|65|km/h|mph|abbr=on}} to {{convert|75|km/h|mph|abbr=on}}. This was followed by train automatic stopping controller (TASC) which was introduced in November 2002, along with automatic train operation (ATO) which was introduced on the main segment of the Marunouchi Line on December 27, 2008. The platform-edge doors at Hōnanchō Station, the terminus of the Hōnanchō Branch, were lengthened to allow six-car trains to use the station, with work starting in 2013, which enabled through trains to and from Ikebukuro to start operating all the way to Hōnanchō from fiscal 2017.{{cite web |url= http://www.nikkei.com/article/DGXNZO62480530S3A111C1L71000/|script-title=ja:丸ノ内線、方南町駅へ直通運転開始 東京メトロが17年度から|trans-title= Tokyo Metro to operate through trains on Marunouchi Line to Hōnanchō Station from fiscal 2017|date= 13 November 2013|work= Nikkei Shimbun|publisher= Nikkei Inc.|location= Japan|language= ja|access-date= 14 November 2013}}

With the start of the revised timetable on December 7, 2024, the Marunouchi Line became the first subway line in Japan to adopt communications-based train control (CBTC) signalling. The new system allows for shorter intervals between trains and improved delay recovery.{{Cite web |last=Kinoshita |first=Kenji |date=2024-12-09 |title= |script-title=ja:東京メトロ丸ノ内線、12/7ダイヤ改正でCBTCシステム導入・使用開始 |trans-title=Tokyo Metro Marunouchi Line adopts CBTC with December 7 timetable revision |url=https://news.mynavi.jp/article/20241209-3081625/ |access-date=2024-12-09 |website=Mynavi News |language=ja}}

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• Shaw, Dennis and Morioka, Hisashi, "Tokyo Subways", published 1992 by Hoikusha Publishing

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• [https://www.tokyometro.jp/en/index.html Tokyo Metro website]

{{Tokyo transit}}

Marunouchi Line

Category:Railway lines in Tokyo

Category:Railway lines opened in 1954

Category:Standard-gauge railways in Japan

Category:1954 establishments in Japan

Category:600 V DC railway electrification