Ōimachi Line

Ōimachi Line
Ōimachi Line
	A 6020 series EMU on an Ōimachi Line local service in October 2025
Overview
Native name	大井町線
Status	In service
Owner	Tokyu Corporation
Line number	OM
Locale	Tokyo and Kanagawa Prefecture
Termini	Mizonokuchi; Ōimachi;
Stations	16
Color on map	Orange
Service
Type	Heavy rail
System	Tokyu Railways
Operator	Tokyu Corporation
Daily ridership	511,214 (FY2018)
History
Opened	6 July 1927; 99 years ago
Technical
Line length	12.4 km (7.7 mi)
Track gauge	1,067 mm (3 ft 6 in)
Electrification	Overhead line, 1,500 V DC
Operating speed	95 km/h (59 mph)
Route map
Route map
	Legend
	Tokyo Waterfront Area
	Rapid Transit
	Tama
	River
	Tokyo
	Kanagawa
	Musashi-
	Mizonokuchi
	Nambu
	line

The Ōimachi Line (Japanese: 大井町線, Hepburn: Ōimachi-sen) is a railway line in Japan operated by the private railway operator Tokyu Corporation. It extends from Ōimachi in Shinagawa, Tokyo to Mizonokuchi in Kawasaki, Kanagawa.

Stations

All-stations "Local" services are classified as blue and green. The latter runs on the express track between Futako-Tamagawa and Mizonokuchi and does not stop at Futako-Shinchi or Takatsu. Limited-stop "Express" services are also provided.

On weekends, two seven-car express trains per days are operated to/from Ōimachi and Nagatsuta on the Tokyu Den-en-toshi Line. Also, a few trains are operated through down to Saginuma in the late evenings. A few express trains during the holidays also serve from Chūō-Rinkan in the mornings, down in the evenings.

No.	Station	Distance in km (mi)	"Blue" local	"Green" local	Express	Transfers	Location
	Ōimachi 大井町	0 (0)	●	●	●	Keihin–Tōhoku Line (JK19) Rinkai Line (R-07)	Shinagawa	Tokyo
	Shimo-shimmei 下神明	0.8 (0.50)	●	●	\|
	Togoshi-kōen 戸越公園	1.5 (0.93)	●	●	\|
	Nakanobu 中延	2.1 (1.3)	●	●	\|	Asakusa Line (A-03)
	Ebaramachi 荏原町	2.7 (1.7)	●	●	\|
	Hatanodai 旗の台	3.2 (2.0)	●	●	●	Ikegami Line (IK05)
	Kita-senzoku 北千束	4.0 (2.5)	●	●	\|		Ōta
	Ōokayama 大岡山	4.8 (3.0)	●	●	●	Meguro Line (MG06)	Meguro
	Midorigaoka 緑が丘	5.3 (3.3)	●	●	\|
	Jiyūgaoka 自由が丘	6.3 (3.9)	●	●	●	Tōyoko Line (TY07)
	Kuhombutsu 九品仏	7.1 (4.4)	●	●	\|		Setagaya
	Oyamadai 尾山台	7.8 (4.8)	●	●	\|
	Todoroki 等々力	8.3 (5.2)	●	●	\|
	Kaminoge 上野毛	9.2 (5.7)	●	●	\|
	Futako-tamagawa 二子玉川	10.4 (6.5)	●	●	●	Den-en-toshi Line (DT07)
	Futako-shinchi 二子新地	11.1 (6.9)	●	\|	\|	Den-en-toshi Line (DT08)	Takatsu-ku, Kawasaki	Kanagawa
	Takatsu 高津	11.7 (7.3)	●	\|	\|	Den-en-toshi Line (DT09)
	Mizonokuchi 溝の口	12.4 (7.7)	●	●	●	Den-en-toshi Line (DT10; limited through service) Nambu Line (Musashi-Mizonokuchi: JN10)
↓ Limited through-running via the Den-en-toshi Line: "Blue" Local trains to/from Saginuma and Express trains to/from Nagatsuta and Chūō-rinkan ↓

Rolling stock

Local services

6020 series five-car EMUs (from July 2025)
9000 series five-car EMUs
9020 series five-car EMUs

A 9000 series EMU in December 2021
A 9020 series EMU in December 2021
A 5-car 6020 series EMU in August 2025

Express services

6000 series seven-car EMUs (since March 2008, originally delivered as six-car sets)
6020 series seven-car EMUs (from March 2018)

A 6000 series EMU in March 2018
A 6020 series EMU in December 2018

Former rolling stock

History

6 July 1927: The section between Ōimachi and Ōokayama was opened by the Mekama Electric Railway (目黒蒲田電鉄).
1 November 1929: The section between Jiyūgaoka and Futako-tamagawa was opened by the Mekama Electric Railway.
25 December 1929: The section between Ōokayama and Jiyūgaoka was opened by Mekama Electric Railway.
29 June 1938: The Mekama Railway was absorbed into the Toyoko Electric Railway (東京横浜電鉄).
15 January 1958: Electric supply was raised to 1,500 V DC.
11 October 1963: The line was renamed the Den-en-toshi Line, together with the section south of Futako-tamagawa.
16 November 1977: Through running started between Shibuya and Nagatsuta.
12 August 1979: The line was renamed the Ōimachi Line and separated from the Den-en-toshi Line south of Futako-tamagawa.
23 February 2008: ATS was replaced by ATC.
28 March 2008: Express services started.
11 July 2009: The Ōimachi Line was extended to Mizonokuchi from Futako-tamagawa.

Express services on the line were lengthened from six to seven cars in late fiscal 2017, and the platforms at Ōimachi, Hatanodai, and Jiyūgaoka were lengthened to handle the longer trains. Since December 2018, "Q Seat" reserved seating has been implemented on some express services that run between Ōimachi and Nagatsuta stations.

References

80周年を迎え進化する東急大井町線-その1-. Japan Railfan Magazine (in Japanese): 118–125. July 2008.

↑ "TOKYU CORPORATION 2019-2020". www.tokyu.co.jp. Retrieved 6 August 2023.
↑ https://www.tokyu.co.jp/railway/ (This reference is for all the "Stations" section.)
↑ 東急6020系6151編成が営業運転を開始 [Tokyu 6020 series set 6151 enters revenue service]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 4 July 2025. Retrieved 4 July 2025.
↑ Hirose, Atsushi (18 February 2019). "東急2000系改め，9020系が登場" [Tokyu 2000 series reclassified as 9020 series]. Japan Railfan Magazine Online (in Japanese). Retrieved 20 December 2021.
↑ 田園都市線および大井町線の朝ラッシュ時の混雑緩和施策を実施 [Measures implemented to alleviate morning rush-hour overcrowding on Denentoshi and Ōimachi Lines] (PDF). News release (in Japanese). Japan: Tokyu Corporation. 22 March 2017. p. 2. Archived (PDF) from the original on 23 March 2017. Retrieved 23 March 2017.
↑ "東急東横線「Q SEAT」導入、10両中2両をロング・クロス転換車両に". Mynavi News (in Japanese). Tokyu Toyoko Line "Q Seat" to be introduced, 2 out of 10 cars to use rotating transverse seating. 29 July 2022. Retrieved 30 July 2022.{{cite web}}: CS1 maint: others (link)

External links

Tokyu Corporation website (in English)

[1] "TOKYU CORPORATION 2019-2020". www.tokyu.co.jp. Retrieved 6 August 2023.

[2] ttps://www.tokyu.co.jp/railway/ (This reference is for all the "Stations" section.)

[3] 東急6020系6151編成が営業運転を開始 [Tokyu 6020 series set 6151 enters revenue service]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 4 July 2025. Retrieved 4 July 2025.

[9020_2019-02-18-4] Hirose, Atsushi (18 February 2019). "東急2000系改め，9020系が登場" [Tokyu 2000 series reclassified as 9020 series]. Japan Railfan Magazine Online (in Japanese). Retrieved 20 December 2021.

[tokyu20170322-5] 田園都市線および大井町線の朝ラッシュ時の混雑緩和施策を実施 [Measures implemented to alleviate morning rush-hour overcrowding on Denentoshi and Ōimachi Lines] (PDF). News release (in Japanese). Japan: Tokyu Corporation. 22 March 2017. p. 2. Archived (PDF) from the original on 23 March 2017. Retrieved 23 March 2017.

[mynavi_toyoko_qseat-6] "東急東横線「Q SEAT」導入、10両中2両をロング・クロス転換車両に". Mynavi News (in Japanese). Tokyu Toyoko Line "Q Seat" to be introduced, 2 out of 10 cars to use rotating transverse seating. 29 July 2022. Retrieved 30 July 2022.{{cite web}}: CS1 maint: others (link)

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Major stations	Chūō-Rinkan Futako-Tamagawa Gotanda Meguro Musashi-Kosugi Ōimachi Sangen-Jaya Shibuya Yokohama

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