209 series

209 series
A 209-0 series set on the Keihin–Tōhoku Line approaching Saitama-Shintoshin Station, October 2006
In service	1992–present
Manufacturers	JR East, Kawasaki Heavy Industries, Tokyu Car Corporation
Replaced	KiHa 35, 103 series, 113 series, 211 series
Constructed	1992–2005
Entered service	7 May 1992 (901/209-900 series) 15 February 1993 (209-0 series)
Number built	1,046 vehicles
Number in service	442 vehicles (as of December 2021)
Number preserved	1 vehicle
Successor	E131 series, E231 series, E233 series
Formation	4/6/8/10 cars per trainset
Operator	JR East
Depots	Kawagoe, Keiyō, Makuhari, Nakahara, Toyoda
Lines served	Chūō Line (Rapid), Hachikō Line, Kashima Line, Kawagoe Line, Keiyō Line, Musashino Line, Narita Line, Ōme Line, Sotobō Line, Sōbu Main Line, Tōgane Line, Uchibō Line
Specifications
Car body construction	Stainless steel
Car length	20,000 mm (65 ft 7 in)
Width	2,966 mm (9 ft 8.8 in) (209-500 series) 2.87 m (9 ft 5 in) (other)
Doors	4/6 pairs per side
Maximum speed	110 km/h (68.4 mph)
Traction system	Variable frequency (GTO, IGBT)
Power output	1,520 kW (6 motors)
Acceleration	2.5 km/(h⋅s) (1.6 mph/s) 3.3 km/(h⋅s) (2.1 mph/s) (209-1000 series)
Deceleration	4.0 km/(h⋅s) (2.5 mph/s)(service) 4.5 km/(h⋅s) (2.8 mph/s) (emergency)
Electric system	1,500 V DC overhead
Current collection	PS28 diamond-shaped pantograph PS21 diamond-shaped pantograph (209-1000 series) PS33A single-arm pantograph (209-500 series)
Braking systems	Regenerative brake, electronically controlled pneumatic brakes
Safety systems	ATS-P, ATS-SN, ATC, Digital ATC
Track gauge	1,067 mm (3 ft 6 in)

The 209 series (209系) is an electric multiple unit (EMU) commuter train type operated by East Japan Railway Company (JR East) in the Tokyo area of Japan since 1993.

The series was introduced in 1992 for experimental operations (as the 901 series) and in 1993 for commercial operations to replace the aging 103 series stock on the Keihin–Tōhoku and Negishi lines. The concept of the 209 series was to create a lower-cost, limited lifespan train (approximately 15 years) that would be replaced rather than rebuilt when they reached the end of their operational lives.

The 209 series was the first of the "new series trains" (新系列電車, Shin-keiretsu densha), and served as the basis for the E501, E217, 701, and E127 series rolling stock, as well as the succeeding E231 series stock, which in turn became the blueprint for successive trains developed by JR East and other railway companies in Japan.

Variants

JR East

• / 209-500 series: 10-car set used on the Keiyō Line since 2008, and 8-car sets on the Musashino Line since 2010
• 209-2000/2100 series: 6/4-car sets converted from former Keihin–Tōhoku—Negishi Line 209-0 series units, used on Narita Line, Sōbu Main Line, Sotobō Line, Tōgane Line, and Uchibō Line services since 2009
• 209-2200 series: 6-car set used from January 2018 as the Boso Bicycle Base
• 209-3500 series: 4-car sets converted from former Chūō–Sōbu Line 209-500 series units, used on the Kawagoe Line and Hachikō Line since 2018

Izukyū Corporation

• Izukyu 3000 series: 4-car set used on the Izu Kyūkō Line since 2022

Former operations

• / 209-0 series: 10-car sets used on the Keihin–Tōhoku—Negishi Line from 1993 until January 2010, and 6-car sets on the Nambu Line until February 2015
• / 209-500 series: 10-car sets used on the Chūō–Sōbu Line from 1998 until April 2019 and the Keihin–Tōhoku—Negishi Line from 2001 to 2009
• 209-900/910/920 series: 10-car prototypes initially classified as 901 series used on the Keihin–Tōhoku—Negishi Line
• 209-950 series: 10-car set used on the Chūō–Sōbu Line until it was redesignated as the E231-900 series
• / Two 209-1000 series 10-car sets used on the Jōban Line from 1999 until October 2018, then later on the Chūō Line (Rapid) (and occasionally the Ōme Line) from March 2019 until September 2024
• 209-2000/2100 series: 4-car sets used on the Kashima Line from 2009 until March 2021
• 209-2200 series: 6-car sets used on the Nambu Line from 2009 until March 2017
• 209-3000 series: 4-car sets used on the Kawagoe Line and Hachikō Line from March 1996 until February 2019
• 209-3100 series: 4-car sets converted from surplus TWR 70-000 series units, used on the Kawagoe Line and Hachikō Line from April 2005 until January 2022

209-0 series

209-0 series
A Keihin–Tōhoku 10-car 209-0 series set in March 2009
In service	1993–2015
Replaced	103 series, 205 series
Constructed	1992–1997
Entered service	1993
Scrapped	2008–2016
Number built	792 vehicles
Number in service	None (324 vehicles converted to 209-2000/2100 series; 18 vehicles converted to 209-2200 series; 7 vehicles converted to MUE-Train; 6 vehicles converted for training units)
Number scrapped	437 vehicles
Formation	10 cars per trainset (Keihin-Tōhoku & Negishi Lines) 6 cars per trainset (Nambu Line)
Operator	JR East
Depots	Urawa, Nakahara
Lines served	Keihin–Tōhoku Line, Nambu Line, Negishi Line
Specifications
Car body construction	Stainless steel
Width	2,870 mm (9 ft 5 in)
Doors	4/6 pairs per side
Traction system	Mitsubishi GTO-VVVF
Traction motors	MT68
Electric system	1,500 V DC overhead catenary
Track gauge	1,067 mm (3 ft 6 in)

The original full-production version introduced on both the Keihin–Tōhoku—Negishi (78 ten-car sets numbered 1–78) and Nambu (2 six-car sets numbered 1 and 32) lines in 1993. Six-door SaHa 208 cars were inserted into the Keihin–Tōhoku—Negishi Line sets in 1995.

The 209 series trains on the Keihin–Tōhoku—Negishi Line were replaced by new E233-1000 series trains from autumn 2007, with the last sets withdrawn by 24 January 2010. A large number of these units were subsequently rebuilt as 209-2000/2100 series four-car and six-car sets for use in the Chiba area, while some were converted as training sets, MUE-Train, or 209-2200 series sets for the Nambu Line.

Formations

Keihin–Tōhoku—Negishi Line 10-car sets

Previously, 78 ten-car sets (1–78) were based at Urawa depot and were formed as shown below, with four motored ("M") cars and six non-powered trailer ("T") cars.

	← Ōmiya Ōfuna →
Car No.	10	9	8	7	6	5	4	3	2	1
Designation	Tc	T	M	M'	T'	T		M	M'	Tc'
Numbering	KuHa 209	SaHa 209	MoHa 209	MoHa 208	SaHa 208	SaHa 209		MoHa 209	MoHa 208	KuHa 208

• Cars 3 and 8 were each equipped with one PS28 pantograph.
• Car 6 was a "6-door" car with six pairs of doors on each side.

Nambu Line 6-car sets

Previously, two six-car sets (1 and 32) were based at Nakahara Depot and were formed as shown below, with four motored ("M") cars and two non-powered trailer ("T") cars.

	← Kawasaki Tachikawa →
Car No.	1	2	3	4	5	6
Designation	Tc	M	M'	M	M'	Tc'
Numbering	KuHa 209	MoHa 209	MoHa 208	MoHa 209	MoHa 208	KuHa 208

• Cars 2 and 4 were each equipped with one PS28 lozenge-type pantograph.

• 
  A Nambu Line 6-car 209-0 series train in January 2008

209-500 series

209-500 series
Musashino Line 209-500 series set M75 on a Local service in October 2019
In service	1998–present
Replaced	103 series, 201 series, 205 series
Constructed	1998–2000
Entered service	29 December 1998
Refurbished	2016–2019
Scrapped	2017–
Number built	170 vehicles
Number in service	98 vehicles (12 sets) (+20 vehicles converted to 209-3500 series)
Number scrapped	52 vehicles
Formation	8/10 cars per trainset
Fleet numbers	Keiyō Line: 34 Musashino Line: M71-M77, M81-M84
Operator	JR East
Depots	Keiyō Previously: Mitaka, Narashino, Urawa
Lines served	Keiyō Line, Musashino Line, Sotobō Line, Uchibō Line Previously: Chūō–Sōbu Line, Keihin–Tōhoku Line, Negishi Line
Specifications
Car body construction	Stainless steel
Width	2,950 mm (9 ft 8 in)
Doors	4 pairs per side
Traction system	IGBT-VVVF (Mitsubishi) Previously: GTO-VVVF
Electric system	1,500 V DC overhead catenary
Track gauge	1,067 mm (3 ft 6 in)

This sub-series represented a stop-gap for use from 1998 on the Chūō–Sōbu Line until the full-production E231 series trains were delivered, and a total of 17 ten-car sets (numbered 51–67) were delivered to Narashino Depot in Chiba. These sets differ noticeably from the other 209 series variants in having 2.95 m (9 ft 8 in) wide cars (compared to 2.87 m (9 ft 5 in) for earlier flat-sided stock), as well as LED destination indicators, replacing the earlier roller blind type. While externally similar in appearance to the later E231 series sets, the 209-500 series are distinguishable by their white cab fronts and lack of six-door cars.

In November 2000, two sets (66 and 67) were transferred to the Keihin–Tōhoku—Negishi Line and renumbered 80 and 81. In December 2003, the Chūō–Sōbu Line sets were reallocated to Mitaka Depot and renumbered 501–515. Between 2005 and 2006, set 515 was lent to the Keihin–Tōhoku—Negishi Line as a spare during car maintenance. Between 2006 and 2007, three more sets (513–515) were transferred to the Keihin–Tōhoku—Negishi Line to replace the prototype 209-900/910/920 series trains and renumbered 82–84. From October 2008, following the introduction of E233-1000 series trains on the Keihin–Tōhoku—Negishi Line, one set (80) was transferred back to the Chūō–Sōbu Line (as set 516) while the other four sets (81–84) were modified (with ATS-P/S_N instead of ATC) and transferred to the Keiyō Line (as sets 31–34).

From September 2010 to January 2011, three former Keiyō Line sets (31–33) were reduced to eight cars and reliveried for use on the Musashino Line, renumbered M71–M73, and entered service from 4 December 2010. In 2012, a "C" suffix was added to all Chūō–Sōbu Line sets (C501–C512 and C516).

From 2018, five Chūō–Sōbu Line sets (C501–C505) were converted to 4-car 209-3500 series sets for use on Kawagoe Line and Hachikō Line services, while the remaining eight sets (C506–C512 and C516) were reduced to 8 cars and reallocated to the Musashino Line and renumbered M74–M77 and M81–M84. The last Chūō–Sōbu Line set, set C511, was withdrawn from service on 19 April 2019.

All sets were refurbished between 2016 and 2019, when the GTO-VVVF traction system was replaced with an IGBT-VVVF traction system.

Set transfer history

The following table shows the transfer history for each of the 17 sets.

	1998–2018								2018–present
501–505 (5 sets)	Chūō–Sōbu Line 51–55→501–505→C501–C505								Converted to 209-3500 series for Hachikō/Kawagoe Line
	1999–2018								2018–present
506–509 (4 sets)	Chūō–Sōbu Line 56–59→506–509→C506–C509								Musashino Line M81–M84
	1999–2019								2019–present
510–512 (3 sets)	Chūō–Sōbu Line 60–62→510–512→C510–C512								Musashino Line M75–M77
	2000–2006				2006–2008	2008–2010		2010–present
513–514 (2 sets)	Chūō–Sōbu Line 63–64→513–514				Keihin–Tōhoku Line 82–83	Keiyō Line 31–32		Musashino Line M71–M72
	2000–2005		2005–2006	2006	2006–2008	2008–2010		2010–present
515	Chūō–Sōbu Line 65→515		Keihin–Tōhoku Line 515	Chūō–Sōbu Line 515	Keihin–Tōhoku Line 84	Keiyō Line 33		Musashino Line M73
	2000	2001–2009					2009–2018		2018–present
516	Chūō–Sōbu Line 66	Keihin–Tōhoku Line 80					Chūō–Sōbu Line 516→C516		Musashino Line M74
	2000	2001–2008				2009–present
517	Chūō–Sōbu Line 67	Keihin–Tōhoku Line 81				Keiyō Line 34

Formations

10-car sets

As of 1 October 2018, one set (34) is allocated to Keiyō Depot for use on the Keiyō Line (and through services to the Sotobō and Uchibō Lines). The set is formed as follows with four motored ("M") cars and six non-powered trailer ("T") cars.

	← Kazusa-Minato, Kazusa-Ichinomiya, Kimitsu, Soga Tokyo →
Car No.	10	9	8	7	6	5	4	3	2	1
Designation	Tc	T	M	M'	T			M	M'	Tc'
Numbering	KuHa 209-500	SaHa 209-500	MoHa 209-500	MoHa 208-500	SaHa 209-500			MoHa 209-500	MoHa 208-500	KuHa 208-500

• Cars 3 and 8 each have one single-arm pantograph.
• Cars 1 and 10 have a wheelchair space.
• Car 4 is designated as a mildly air-conditioned car.

8-car sets

As of 1 January 2020, 11 eight-car sets (M71 to M77, M81 to M84) were allocated to Keiyō Depot for use on Musashino Line (and through services to the Keiyō Line). These sets are formed as follows with four motored ("M") cars and four non-powered trailer ("T") cars.

	← Tokyo, Kaihinmakuhari, Nishi-Funabashi Fuchūhommachi →
Car No.	1	2	3	4	5	6	7	8
Designation	Tc	M	M'	T		M	M'	Tc'
Numbering	KuHa 209-500	MoHa 209-500	MoHa 208-500	SaHa 209-500		MoHa 209-500	MoHa 208-500	KuHa 208-500

• Cars 2 and 6 each have one pantograph (single-arm on sets M71–M77, lozenge-type on sets M81– M84).
• Cars 1 and 8 have a wheelchair space.
• Car 4 is designated as a mildly air-conditioned car.

Previous formations

Chūō–Sōbu Line 10-car sets (1998 to 2019)

	← Chiba, Tsudanuma Nakano, Mitaka →
Car No.	1	2	3	4	5	6	7	8	9	10
Designation	Tc	T	M	M'	T			M	M'	Tc'
Numbering	KuHa 209-500	SaHa 209-500	MoHa 209-500	MoHa 208-500	SaHa 209-500			MoHa 209-500	MoHa 208-500	KuHa 208-500

Keihin–Tōhoku—Negishi Line 10-car sets (2001 to 2009)

	← Ōmiya Ōfuna →
Car No.	10	9	8	7	6	5	4	3	2	1
Designation	Tc	T	M	M'	T			M	M'	Tc'
Numbering	KuHa 209-500	SaHa 209-500	MoHa 209-500	MoHa 208-500	SaHa 209-500			MoHa 209-500	MoHa 208-500	KuHa 208-500

• 
  A Chūō–Sōbu Line 209-500 series train at Akihabara station in April 2009
• 
  A Keihin–Tōhoku—Negishi Line 209-500 series in November 2008
• 
  A Keiyō Line 209-500 series in October 2020

209-900/910/920 series

209-900/910/920 series
901 series Set C (later 209-920 series) in March 1993
In service	1992–2007
Constructed	1992
Entered service	7 May 1992
Scrapped	2007–2008
Number built	30 vehicles
Number preserved	1 vehicle (at Tōkyō General Rolling Stock Center)
Number scrapped	29 vehicles
Formation	10 cars per trainset
Operator	JR East
Depot	Urawa
Lines served	Keihin–Tōhoku Line, Negishi Line
Specifications
Car body construction	Stainless steel
Width	2,870 mm (9 ft 5 in)
Doors	4 pairs per side
Electric system	1,500 V DC overhead catenary
Track gauge	1,067 mm (3 ft 6 in)

Three ten-car prototypes were built in 1992 for testing and passenger evaluation on the Keihin–Tōhoku—Negishi Line, initially classified as 901 series. Set A was built by Kawasaki Heavy Industries, set B by Tokyu Car Corporation, and set C was built by Kawasaki Heavy Industries and JR East's Ōfuna factory (cars 4 and 5). The three sets incorporated a number of different design features for evaluation, but were converted in 1994 to bring them in line with the full-production specifications. Set A became 209-900 series set 90, set B became 209-910 series set 91, and set C became 209-920 series set 92. They differed from the full-production 209-0 series sets in not having six-door SaHa 208 cars.

209-910 series set 91 was withdrawn in December 2006, and the last of the three prototype sets, set 90, was withdrawn in August 2007. Car KuHa 209-901 from the original 901 series set A was stored at Nagano Works, and later preserved at Tōkyō General Rolling Stock Center.

• 
  209-900 series set 90 in November 2006
• 
  209-920 series set 92 in January 2007

Formation

	← Ōmiya Ōfuna →
Car No.	10	9	8	7	6	5	4	3	2	1
Designation	Tc	T	M	M'	T			M	M'	Tc'
Numbering (1992 to 1994)	KuHa 901	SaHa 901	MoHa 901	MoHa 900	SaHa 901			MoHa 901	MoHa 900	KuHa 900
Numbering (1994 to 2007)	KuHa 209-900	SaHa 209-900	MoHa 209-900	MoHa 208-900	SaHa 208-900	SaHa 209-900		MoHa 209-900	MoHa 208-900	KuHa 208-900
	KuHa 209-910	SaHa 209-910	MoHa 209-910	MoHa 208-910	SaHa 208-910	SaHa 209-910		MoHa 209-910	MoHa 208-910	KuHa 208-910
	KuHa 209-920	SaHa 209-920	MoHa 209-920	MoHa 208-920	SaHa 208-920	SaHa 209-920		MoHa 209-920	MoHa 208-920	KuHa 208-920

209-950 series

Main article: E231 series § E231-900 series

This was the original classification given to the prototype E231 series 10-car set delivered in October 1998, to test out the then-new insulated-gate bipolar transistor (IGBT) traction system and TIMS passenger information system. It was reclassified as E231-900 series in June 2000 following conversion to the full-production E231 standard.

209-1000 series

209-1000 series
A Chūō Line (Rapid) 10-car 209-1000 series set in November 2022 near Musashi-Sakai
In service	1999–2024
Constructed	1999
Entered service	December 1999
Number built	20 vehicles (2 sets)
Number in service	0 vehicles
Number scrapped	20 vehicles (2 sets)
Formation	10 cars per trainset
Fleet numbers	81–82
Operator	JR East
Depots	Toyoda (2019-2024) Matsudo (1999-2018)
Lines served	Chūō Line (Rapid), Ōme Line, Jōban Line, Tokyo Metro Chiyoda Line
Specifications
Car body construction	Stainless steel
Width	2,870 mm (9 ft 5 in)
Doors	4 pairs per side
Traction system	GTO-VVVF (Mitsubishi)
Electric system	1,500 V DC overhead catenary
Track gauge	1,067 mm (3 ft 6 in)

Two 10-car sets (81 and 82) were delivered from Tokyu Car Corporation in August and September 1999, entering service from 4 December 1999 on Jōban Line and Tokyo Metro Chiyoda Line inter-running services. Based on the 209-0 series, these trains have end doors for use in emergencies inside tunnels. These sets were based at JR East's Matsudo depot. These train sets have since been withdrawn from the Jōban Line in October 2018 and reallocated to the Chūō Line (Rapid) in December 2018, being based at JR East's Toyoda Depot after the reallocation. Operations officially started on the Chūō Line in March 2019.

While these sets usually operate only between Tokyo and Takao, on rare occasions (such as a shortage of train sets due to an accident) they may operate as far as Ōtsuki, or on the Ōme Line as far as Ōme. Furthermore, unlike the E233 series in use, due to the lack of passenger-operated door controls, all doors open on these sets while in use on the Ōme Line.

After the introduction of 12-car E233-0 series sets with Green cars on the Chūō Line, these sets were withdrawn from service on 6 September 2024. Set 82 was locomotive-hauled to the Nagano General Rolling Stock Center in January 2025, followed by set 81 in February. Both sets were then scrapped on 7 April 2025.

Formation

10-car Jōban Line sets (1999 to 2018)

	← Toride, Ayase Yoyogi-Uehara →
Car No.	10	9	8	7	6	5	4	3	2	1
Designation	Tc	M	M'	T	M	M'	T	M	M'	Tc'
Numbering	KuHa 209-1000	MoHa 209-1000	MoHa 208-1000	SaHa 209-1000	MoHa 209-1000	MoHa 208-1000	SaHa 209-1000	MoHa 209-1000	MoHa 208-1000	KuHa 208-1000

• Cars 3, 6 and 9 were originally fitted with PS21 lozenge type pantographs, but were converted to single-arm models in 2014.
• Cars 2 and 9 had wheelchair space.
• Car 4 was designated as a mildly air-conditioned car.

10-car Chūō Line sets (2019 to 2024)

	← Tōkyō Ōtsuki →
Car No.	1	2	3	4	5	6	7	8	9	10
Designation	Tc	M	M'	T	M	M'	T	M	M'	Tc'
Numbering	KuHa 209-1000	MoHa 209-1000	MoHa 208-1000	SaHa 209-1000	MoHa 209-1000	MoHa 208-1000	SaHa 209-1000	MoHa 209-1000	MoHa 208-1000	KuHa 208-1000

• Cars 2, 5 and 8 each had one single-arm pantograph.
• Cars 2 and 9 had wheelchair space.
• Car 4 was designated as a mildly air-conditioned car.

• 
  Set 81 in original Jōban Line livery, May 2018

Interior

• 
  209-1000 series interior view in 27 December 2022
• 
  Priority seating in 27 December 2022

209-2000/2100 series

209-2000/2100 series
A Chiba-area 209-2100 series 6-car train in June 2021
In service	2009–present
Replaced	211 series
Entered service	1 October 2009
Refurbished	2009–2013 (converted from 209-0 series)
Number built	324 vehicles
Number in service	276 vehicles (62 sets)
Number preserved	8 vehicles stored
Number scrapped	30 vehicles
Successor	E131 series (rural services)
Formation	4/6 cars per trainset
Fleet numbers	C401–C448, C602–C604, C606–C608, C610, C615, C617, C621–C625
Operator	JR East
Depot	Makuhari
Lines served	Narita Line, Sōbu Main Line, Sotobō Line, Tōgane Line, Uchibō Line, Izu Kyūkō Line Previously: Kashima Line
Specifications
Car body construction	Stainless steel
Width	2,870 mm (9 ft 5 in)
Doors	4 pairs per side
Traction system	Mitsubishi IGBT-VVVF
Traction motors	MT73 (prior to conversion – MT68)
Electric system	1,500 V DC overhead catenary
Track gauge	1,067 mm (3 ft 6 in)

These are four- and six-car sets based at Makuhari Depot modified between 2009 and 2013 from former Keihin–Tōhoku—Negishi Line 209-0 series ten-car sets for use on Chiba area and Bōsō Peninsula local services from 1 October 2009 to replace ageing 211 series trains. Modifications include new electrical equipment, the addition of transverse seating to end cars, LED destination indicator panels, and a toilet. The cars are numbered in the -2100 series, although nine four-car sets have end cars numbered in the -2000 series. The -2000 series cars are converted from early batch 209-0 series units with air-operated doors rather than the electrically operated doors of later batch units.

The first four-car set (C417) was outshopped from Nagano Works in June 2009, while the first six-car set (C602) was outshopped from Ōmiya Works in July 2009. The entire conversion process was completed in 2013, and a total of 42 four-car sets (C401–C442) and 26 six-car sets (C601–C626) were formed.

From 13 March 2021, they were replaced on rural services with new E131 series trains. Six 6-car sets were shortened to 4-car sets between February and March 2021; the two surplus cars from each set along with three others 6-car sets (C612, C618, C626) were scrapped between April and May 2021.

In July 2021, 6-car set C609 was removed from JR service and delivered to Izukyū Corporation, and four cars from set C601 were delivered in November 2021. These sets entered service on 30 April 2022 as the Izukyu 3000 series.

The table below shows the converted sets.

Former 6-car set	Conversion date	New 4-car set
C605	15 March 2021	C443
C611	4 March 2021	C444
C613	1 March 2021	C445
C614	22 March 2021	C446
C616	8 March 2021	C447
C620	24 February 2021	C448

Formations

6-car sets

As of 22 December 2021, 14 six-car sets (C602–C604, C606–C608, C610, C615, C617, C621–C625) are based at Makuhari Depot and were formed as shown below, with four motored ("M") cars and two non-powered trailer ("T") cars.

	← Awa-Kamogawa, Chōshi Chiba →
Car No.	6	5	4	3	2	1
Designation	Tc	M	M'	M	M'	Tc'
Numbering	KuHa 209-2100	MoHa 209-2100	MoHa 208-2100	MoHa 209-2100	MoHa 208-2100	KuHa 208-2100

• Cars 3 and 5 are each equipped with one lozenge-type pantograph.

4-car sets

As of 24 March 2021, 48 four-car sets (C401–C448) are based at Makuhari Depot and were formed as shown below, with two motored ("M") cars and two non-powered trailer ("T") cars.

	← Awa-Kamogawa, Chōshi Chiba →
Car No.	4	3	2	1
Designation	Tc	M	M'	Tc'
Numbering	KuHa 209-2000/2100	MoHa 209-2100	MoHa 208-2100	KuHa 208-2000/2100

• Car 3 is equipped with one lozenge-type pantograph.

Interior

Passenger accommodation consists primarily of longitudinal seating, with the end cars featuring some transverse seating bays. Car 2 is fitted with a toilet in all sets.

• 
  Interior of 209-2100 series car with longitudinal seating in March 2021
• 
  Interior of 209-2100 series car with transverse seating in 20 August 2023
• 
  Toilet of a 209-2100 series set

209-2200 series

209-2200 series
209-2200 series "B.B.Base" set J1 in January 2021
In service	2009–present
Replaced	209-0 series 205-1200 series
Constructed	1993–1995
Entered service	Nambu Line: June 2009 B.B.Base: January 2018
Refurbished	2009–2010, 2017
Scrapped	2015
Number built	18 vehicles (3 sets)
Number in service	6 vehicles (1 set)
Number scrapped	12 vehicles (2 sets)
Formation	6 cars per trainset
Fleet numbers	J1 Previously: 52–54
Operator	JR East
Depots	Makuhari Previously: Nakahara
Lines served	Uchibō Line, Sotobō Line, Narita Line, Sōbu Main Line Previously: Nambu Line
Specifications
Car body construction	Stainless steel
Width	2,870 mm (9 ft 5 in)
Doors	4 pairs per side
Electric system	1,500 V DC overhead catenary
Track gauge	1,067 mm (3 ft 6 in)

Between 2009 and 2010, three six-car sets were reformed from former Keihin–Tōhoku—Negishi Line 209-0 series ten-car sets for use on Nambu Line services, replacing the early-batch 209-0 series set and a 205-1200 series set. The first set, number 52, was outshopped in May 2009, and entered service on 12 June 2009. Modifications include new electrical equipment and the addition of LED destination indicator panels.

Two sets (52 and 54) were removed from service and replaced by new E233-8000 series trains in 2015. These two sets were scrapped.

The last remaining Nambu Line 209-2200 series trainset, set 53, was removed from services from 15 March 2017, being replaced by an E233-8500 series set. The set was modified for use as a train for carrying cyclists and their bicycles from Ryogoku in Tokyo to various destinations on the Uchibō Line, Sotobō Line, Narita Line, and Sōbu Main Line on the Bōsō Peninsula. Branded "B.B.Base" (an abbreviation for "Boso Bicycle Base"), it re-entered service on 6 January 2018.

Formation

B.B.Base 6-car set

One six-car set (J1) is based at Makuhari Depot and is formed as shown below, with four motored ("M") cars and two non-powered trailer ("T") cars.

	← Wadaura, Awa-Kamogawa, Chōshi, Sawara Ryōgoku →
Car No.	6	5	4	3	2	1
Designation	Tc	M	M'	M	M'	Tc'
Numbering	KuHa 209-2200	MoHa 209-2200	MoHa 208-2200	MoHa 209-2200	MoHa 208-2200	KuHa 208-2200
Seating capacity	20	20	-	20	19	20

• Cars 3 and 5 each have one PS33F single-arm pantograph.
• Cars 1 to 3 and 5 to 6 have fixed seating bays arranged 2+1 abreast with cycle racks provided next to each of the doorways, while car 4 has an open configuration with bench seating on one side and a bar counter.
• Wheelchair-accessible toilets are provided in cars 2 and 4.

Previous formations

Nambu Line 6-car sets

Previously, three six-car sets (52–54) were based at Nakahara Depot and were formed as shown below, with four motored ("M") cars and two non-powered trailer ("T") cars.

	← Kawasaki Tachikawa →
Car No.	1	2	3	4	5	6
Designation	Tc	M	M'	M	M'	Tc'
Numbering	KuHa 209-2200	MoHa 209-2200	MoHa 208-2200	MoHa 209-2200	MoHa 208-2200	KuHa 208-2200

• Cars 2 and 4 were each equipped with one PS28A lozenge-type pantograph.

• 
  Nambu Line 209-2200 series set Naha52 at Shitte Station in September 2010

209-3000 series

209-3000 series
Kawagoe/Hachikō Line 209-3000 series set 61 in April 2017
In service	1996–2019
Replaced	KiHa 35
Constructed	1996
Entered service	16 March 1996
Scrapped	2018 (2 vehicles), 2020 (12 vehicles)
Number built	16 vehicles (4 sets)
Number in service	None (2 vehicles converted to training units)
Number scrapped	14 vehicles
Successor	209-3500 series, E231-3000 series
Formation	4 cars per trainset
Fleet numbers	61–64
Operator	JR East
Depot	Kawagoe
Lines served	Hachikō Line, Kawagoe Line
Specifications
Car body construction	Stainless steel
Width	2,870 mm (9 ft 5 in)
Doors	4 pairs per side
Electric system	1,500 V DC overhead catenary
Track gauge	1,067 mm (3 ft 6 in)

Four four-car 6th-batch sets were introduced on 16 March 1996 for use on the Kawagoe Line and newly electrified southern section of the Hachikō Line. These sets (numbers 61 to 64) were based at JR East's Kawagoe depot. While visually similar to the original 209-0 sub-series, these sets differ in having passenger-operated door controls.

These sets were displaced by newly refurbished E231-3000 series and 209-3500 series sets entering service from 2017 and 2018, with the last set withdrawn in February 2019. In late 2018, two cars of set 62 were formed into a training unit and the other two cars were scrapped; the remaining three sets were scrapped in early 2020.

Interior

For a short period in 2004, KuHa 209-3003 of set 63 was fitted with transverse seating bays to increase seating capacity. It was later reverted to standard longitudinal bench seating.

Between February and March 2007, some of the previously sealed windows in each car were modified to allow them to be opened.