# 209 series

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, minimal lifespan train (approximately 15 years) that would be replaced rather than rebuilt when they became life-expired.
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

* / 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

### 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
* / 209-1000 series 10-car sets used on the Jōban Line from 1999 until October 2018. Two sets were later operated on the Chūō Line (Rapid) (and occasionally the Ōme Line) from March 2019 until October 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

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

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 | 1998–2018 | 1998–2018 | 1998–2018 | 1998–2018 | 1998–2018 | 1998–2018 | 1998–2018 | 2018–present |
| 501–505 (5 sets) | Chūō–Sōbu Line 51–55→501–505→C501–C505 | Chūō–Sōbu Line 51–55→501–505→C501–C505 | Chūō–Sōbu Line 51–55→501–505→C501–C505 | Chūō–Sōbu Line 51–55→501–505→C501–C505 | Chūō–Sōbu Line 51–55→501–505→C501–C505 | Chūō–Sōbu Line 51–55→501–505→C501–C505 | Chūō–Sōbu Line 51–55→501–505→C501–C505 | Chūō–Sōbu Line 51–55→501–505→C501–C505 | Converted to 209-3500 series for Hachikō/Kawagoe Line |
| | 1999–2018 | 1999–2018 | 1999–2018 | 1999–2018 | 1999–2018 | 1999–2018 | 1999–2018 | 1999–2018 | 2018–present |
| 506–509 (4 sets) | Chūō–Sōbu Line 56–59→506–509→C506–C509 | Chūō–Sōbu Line 56–59→506–509→C506–C509 | Chūō–Sōbu Line 56–59→506–509→C506–C509 | Chūō–Sōbu Line 56–59→506–509→C506–C509 | Chūō–Sōbu Line 56–59→506–509→C506–C509 | Chūō–Sōbu Line 56–59→506–509→C506–C509 | Chūō–Sōbu Line 56–59→506–509→C506–C509 | Chūō–Sōbu Line 56–59→506–509→C506–C509 | Musashino Line M81–M84 |
| | 1999–2019 | 1999–2019 | 1999–2019 | 1999–2019 | 1999–2019 | 1999–2019 | 1999–2019 | 1999–2019 | 2019–present |
| 510–512 (3 sets) | Chūō–Sōbu Line 60–62→510–512→C510–C512 | Chūō–Sōbu Line 60–62→510–512→C510–C512 | Chūō–Sōbu Line 60–62→510–512→C510–C512 | Chūō–Sōbu Line 60–62→510–512→C510–C512 | Chūō–Sōbu Line 60–62→510–512→C510–C512 | Chūō–Sōbu Line 60–62→510–512→C510–C512 | Chūō–Sōbu Line 60–62→510–512→C510–C512 | Chūō–Sōbu Line 60–62→510–512→C510–C512 | Musashino Line M75–M77 |
| | 2000–2006 | 2000–2006 | 2000–2006 | 2000–2006 | 2006–2008 | 2008–2010 | 2008–2010 | 2010–present | 2010–present |
| 513–514 (2 sets) | Chūō–Sōbu Line 63–64→513–514 | Chūō–Sōbu Line 63–64→513–514 | Chūō–Sōbu Line 63–64→513–514 | Chūō–Sōbu Line 63–64→513–514 | Keihin–Tōhoku Line 82–83 | Keiyō Line 31–32 | Keiyō Line 31–32 | Musashino Line M71–M72 | Musashino Line M71–M72 |
| | 2000–2005 | 2000–2005 | 2005–2006 | 2006 | 2006–2008 | 2008–2010 | 2008–2010 | 2010–present | 2010–present |
| 515 | Chūō–Sōbu Line 65→515 | Chūō–Sōbu Line 65→515 | Keihin–Tōhoku Line 515 | Chūō–Sōbu Line 515 | Keihin–Tōhoku Line 84 | Keiyō Line 33 | Keiyō Line 33 | Musashino Line M73 | Musashino Line M73 |
| | 2000 | 2001–2009 | 2001–2009 | 2001–2009 | 2001–2009 | 2001–2009 | 2009–2018 | 2009–2018 | 2018–present |
| 516 | Chūō–Sōbu Line 66 | Keihin–Tōhoku Line 80 | Keihin–Tōhoku Line 80 | Keihin–Tōhoku Line 80 | Keihin–Tōhoku Line 80 | Keihin–Tōhoku Line 80 | Chūō–Sōbu Line 516→C516 | Chūō–Sōbu Line 516→C516 | Musashino Line M74 |
| | 2000 | 2001–2008 | 2001–2008 | 2001–2008 | 2001–2008 | 2009–present | 2009–present | 2009–present | 2009–present |
| 517 | Chūō–Sōbu Line 67 | Keihin–Tōhoku Line 81 | Keihin–Tōhoku Line 81 | Keihin–Tōhoku Line 81 | Keihin–Tōhoku Line 81 | Keiyō Line 34 | Keiyō Line 34 | Keiyō Line 34 | 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, SogaTokyo → | ← Kazusa-Minato, Kazusa-Ichinomiya, Kimitsu, SogaTokyo → | ← Kazusa-Minato, Kazusa-Ichinomiya, Kimitsu, SogaTokyo → | ← Kazusa-Minato, Kazusa-Ichinomiya, Kimitsu, SogaTokyo → | ← Kazusa-Minato, Kazusa-Ichinomiya, Kimitsu, SogaTokyo → | ← Kazusa-Minato, Kazusa-Ichinomiya, Kimitsu, SogaTokyo → | ← Kazusa-Minato, Kazusa-Ichinomiya, Kimitsu, SogaTokyo → | ← Kazusa-Minato, Kazusa-Ichinomiya, Kimitsu, SogaTokyo → | ← Kazusa-Minato, Kazusa-Ichinomiya, Kimitsu, SogaTokyo → | ← Kazusa-Minato, Kazusa-Ichinomiya, Kimitsu, SogaTokyo → |
| Car No. | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 |
| Designation | Tc | T | M | M' | T | T | T | M | M' | Tc' |
| Numbering | KuHa 209-500 | SaHa 209-500 | MoHa 209-500 | MoHa 208-500 | SaHa 209-500 | SaHa 209-500 | 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-FunabashiFuchūhommachi → | ← Tokyo, Kaihinmakuhari, Nishi-FunabashiFuchūhommachi → | ← Tokyo, Kaihinmakuhari, Nishi-FunabashiFuchūhommachi → | ← Tokyo, Kaihinmakuhari, Nishi-FunabashiFuchūhommachi → | ← Tokyo, Kaihinmakuhari, Nishi-FunabashiFuchūhommachi → | ← Tokyo, Kaihinmakuhari, Nishi-FunabashiFuchūhommachi → | ← Tokyo, Kaihinmakuhari, Nishi-FunabashiFuchūhommachi → | ← Tokyo, Kaihinmakuhari, Nishi-FunabashiFuchūhommachi → |
| Car No. | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Designation | Tc | M | M' | T | T | M | M' | Tc' |
| Numbering | KuHa 209-500 | MoHa 209-500 | MoHa 208-500 | SaHa 209-500 | 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, TsudanumaNakano, Mitaka → | ← Chiba, TsudanumaNakano, Mitaka → | ← Chiba, TsudanumaNakano, Mitaka → | ← Chiba, TsudanumaNakano, Mitaka → | ← Chiba, TsudanumaNakano, Mitaka → | ← Chiba, TsudanumaNakano, Mitaka → | ← Chiba, TsudanumaNakano, Mitaka → | ← Chiba, TsudanumaNakano, Mitaka → | ← Chiba, TsudanumaNakano, Mitaka → | ← Chiba, TsudanumaNakano, Mitaka → |
| Car No. | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Designation | Tc | T | M | M' | T | T | T | M | M' | Tc' |
| Numbering | KuHa 209-500 | SaHa 209-500 | MoHa 209-500 | MoHa 208-500 | SaHa 209-500 | SaHa 209-500 | SaHa 209-500 | MoHa 209-500 | MoHa 208-500 | KuHa 208-500 |

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

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

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

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

## 209-950 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

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.
The 209-1000 series left service (did not officially retire) because it did not have the TASC (定位置停車支援装置) after it retired, the 12 car Chuo line with green cars has entered service.

### Formation

As of 16 March 2021, two 10-car sets (81–82) are allocated to Toyoda Depot and are formed as follows with six motored ("M") cars and four non-powered trailer ("T") cars.
| | ← TōkyōŌtsuki → | ← TōkyōŌtsuki → | ← TōkyōŌtsuki → | ← TōkyōŌtsuki → | ← TōkyōŌtsuki → | ← TōkyōŌtsuki → | ← TōkyōŌtsuki → | ← TōkyōŌtsuki → | ← TōkyōŌtsuki → | ← TōkyōŌtsuki → |
| 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 have one single-arm pantograph.
* Cars 2 and 9 have wheelchair space.
* Car 4 is designated as a mildly air-conditioned car.

### Previous formation
#### 10-car Jōban Line sets (1999 to 2018)

| | ← Toride, AyaseYoyogi-Uehara → | ← Toride, AyaseYoyogi-Uehara → | ← Toride, AyaseYoyogi-Uehara → | ← Toride, AyaseYoyogi-Uehara → | ← Toride, AyaseYoyogi-Uehara → | ← Toride, AyaseYoyogi-Uehara → | ← Toride, AyaseYoyogi-Uehara → | ← Toride, AyaseYoyogi-Uehara → | ← Toride, AyaseYoyogi-Uehara → | ← Toride, AyaseYoyogi-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.
* Set 81 in original Jōban Line livery, May 2018

### Interior

* Jōban Line 209-1000 series interior view in August 2007
* Priority seating in November 2010

## 209-2000/2100 series

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, ChōshiChiba → | ← Awa-Kamogawa, ChōshiChiba → | ← Awa-Kamogawa, ChōshiChiba → | ← Awa-Kamogawa, ChōshiChiba → | ← Awa-Kamogawa, ChōshiChiba → | ← Awa-Kamogawa, ChōshiChiba → |
| 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, ChōshiChiba → | ← Awa-Kamogawa, ChōshiChiba → | ← Awa-Kamogawa, ChōshiChiba → | ← Awa-Kamogawa, ChōshiChiba → |
| 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 June 2012
* Toilet of a 209-2100 series set

## 209-2200 series

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, SawaraRyōgoku → | ← Wadaura, Awa-Kamogawa, Chōshi, SawaraRyōgoku → | ← Wadaura, Awa-Kamogawa, Chōshi, SawaraRyōgoku → | ← Wadaura, Awa-Kamogawa, Chōshi, SawaraRyōgoku → | ← Wadaura, Awa-Kamogawa, Chōshi, SawaraRyōgoku → | ← Wadaura, Awa-Kamogawa, Chōshi, SawaraRyōgoku → |
| 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.
| | ← KawasakiTachikawa → | ← KawasakiTachikawa → | ← KawasakiTachikawa → | ← KawasakiTachikawa → | ← KawasakiTachikawa → | ← KawasakiTachikawa → |
| 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

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.

### Formation (former Hachikō and Kawagoe Line sets)

The four four-car sets were based at Kawagoe depot in Saitama and formed as shown below with two motored ("M") cars and two non-powered trailer ("T") cars.
| | ← KawagoeHachiōji → | ← KawagoeHachiōji → | ← KawagoeHachiōji → | ← KawagoeHachiōji → |
| Car No. | 4 | 3 | 2 | 1 |
| Designation | Tc | M | M' | Tc' |
| Numbering | KuHa 209-3000 | MoHa 209-3000 | MoHa 208-3000 | KuHa 208-3000 |
* Car 3 was fitted with one PS28 lozenge-type pantograph.

### Build details

| Set | Manufacturer | Date delivered |
| 61 | Kawasaki Heavy Industries | January 1996 |
| 62 | Tokyu Car Corporation | January 1996 |
| 63 | Tokyu Car Corporation | February 1996 |
| 64 | Tokyu Car Corporation | February 1996 |

## 209-3100 series

This sub-series of two four-car sets was introduced on 17 April 2005 as part of the scheme to eliminate 103 series sets from the Kawagoe Line and the Hachikō Line. Set number 71 consists of two former Tokyo Waterfront Railway 70-000 series control cars with two newly manufactured intermediate cars, while set number 72 consists entirely of former 70-000 series cars. The 70-000 series cars had become surplus when six-car sets were reformed into ten-car sets in 2004. Like the 209-3000 series, these sets have passenger-operated door controls.
After being displaced by the 209-3500 and E231-3000 series sets, these sets were taken out of service in October 2019. However, they re-entered service and served as additional trains as the 209-3500 and E231-3000 series sets were modified for wanman driver-only operations. They were removed from service in January 2022 after a special retirement tour event; the sets were then officially retired on 11 March 2022.

### Formation

The two four-car sets were based at Kawagoe depot in Saitama and formed as shown below with two motored ("M") cars and two non-powered trailer ("T") cars.
| | ← KawagoeHachiōji → | ← KawagoeHachiōji → | ← KawagoeHachiōji → | ← KawagoeHachiōji → |
| Car No. | 4 | 3 | 2 | 1 |
| Designation | Tc | M | M' | Tc' |
| Numbering | KuHa 209-3100 | MoHa 209-3100 | MoHa 208-3100 | KuHa 208-3100 |
* Car 3 was fitted with one PS28 lozenge-type pantograph.

### Former TWR 70-000 series conversions

The identities of the six former 70-000 series cars converted in 2004 and 2005 to become 209-3100 series EMUs are as shown below.
| Car number | Set number | Former car number | Date returned to traffic |
| KuHa 209-3101 | 71 | 70-020 | 14 March 2005 |
| KuHa 208-3101 | 71 | 70-029 | 14 March 2005 |
| KuHa 209-3102 | 72 | 70-030 | 16 December 2004 |
| MoHa 209-3102 | 72 | 70-027 | 16 December 2004 |
| MoHa 208-3102 | 72 | 70-028 | 16 December 2004 |
| KuHa 209-3102 | 72 | 70-039 | 16 December 2004 |

## 209-3500 series

From 2018, five former 209-500 series ten-car sets based at Mitaka Depot for use on Chūō–Sōbu Line services were reformed and converted to become four-car 209-3500 series sets based at Kawagoe for use on Kawagoe Line and Hachikō Line services.
Between November 2020 and October 2021, the trains were modified for driver-only operation (wanman (ワンマン, "one man")).

### Formation

| | ← KawagoeHachiōji → | ← KawagoeHachiōji → | ← KawagoeHachiōji → | ← KawagoeHachiōji → |
| Car No. | 4 | 3 | 2 | 1 |
| Designation | Tc | M | M' | Tc' |
| Numbering | KuHa 209-3500 | MoHa 209-3500 | MoHa 208-3500 | KuHa 208-3500 |

### Former set/car identities

The former identities of the 209-3500 series sets are as follows.
| Set No. | Car numbers | Car numbers | Car numbers | Car numbers | Former set No. | Former car numbers | Former car numbers | Former car numbers | Former car numbers |
| 51 | KuHa 209-3501 | MoHa 209-3501 | MoHa 208-3501 | KuHa 208-3501 | C501 | KuHa 209-501 | MoHa 209-502 | MoHa 208-502 | KuHa 208-501 |
| 52 | KuHa 209-3502 | MoHa 209-3502 | MoHa 208-3502 | KuHa 208-3502 | C502 | KuHa 209-502 | MoHa 209-504 | MoHa 208-504 | KuHa 208-502 |
| 53 | KuHa 209-3503 | MoHa 209-3503 | MoHa 208-3503 | KuHa 208-3503 | C503 | KuHa 209-503 | MoHa 209-506 | MoHa 208-506 | KuHa 208-503 |
| 54 | KuHa 209-3504 | MoHa 209-3504 | MoHa 208-3504 | KuHa 208-3504 | C504 | KuHa 209-504 | MoHa 209-508 | MoHa 208-508 | KuHa 208-504 |
| 55 | KuHa 209-3505 | MoHa 209-3505 | MoHa 208-3505 | KuHa 208-3505 | C505 | KuHa 209-505 | MoHa 209-510 | MoHa 208-510 | KuHa 208-505 |

## Training sets

In 2008, three motored pairs from former Keihin–Tōhoku—Negishi Line 209-0 series sets (MoHa 209-39/208-39 and MoHa 209-40/208-40 from set Ura 19, and MoHa 209-76/208-76 from set Ura 37) were fitted with driving cabs and converted into training sets. These sets were assigned to Yokohama, Hachiōji, and Ōmiya Training Centers. In 2018, one motored pair from a former Kawagoe/Hachikō Line 209-3000 series set (MoHa 209-3002/208-3002 from set Hae 62) was also fitted with driving cabs and converted into a training set. The existing three training sets were subsequently refurbished and reallocated.
* Ōmiya area 2-car training set in March 2008
* Hachiōji area 2-car training set in October 2008
* Nagano area 2-car training set in April 2021

### Yokohama

From 2008, a training set consisting of KuMoHa 209-39/208-39 is allocated to Yokohama Training Center near Kurihama Station. The set is finished with pale yellow body stripes and bears the text "YOKOHAMA Training Center". It replaced the existing 105 series two-car training set located there.

### Ōmiya

From 2018, a training set consisting of KuMoHa 209-3002/208-3002 is allocated to Ōmiya Training Center. The set is finished with Shōnan green/orange body stripes and bears the text "TOKYO•OMIYA Training Center".
Between 2008 and 2018, set KuMoHa 209-76/208-76 was allocated to Ōmiya. This replaced the existing 103 series two-car training set located there.

### Hachiōji

From 2019, a training set consisting of KuMoHa 209-76/208-76 is allocated to Hachiōji Training Center near Shin-Akitsu Station. The set is finished with orange body stripes and bears the text "HACHIOJI Training Center".
Between 2008 and 2019, set KuMoHa 209-40/208-40 was allocated to Hachiōji. This replaced the existing 105 series two-car training set located there.

### Nagano

From 2019, a training set consisting of KuMoHa 209-40/208-40 is allocated to Nagano Training Center. The set is finished in with Nagano blue body stripes and bears the text "NAGANO Training Center". It replaced the existing 115 series two-car training set located there.

### Shirakawa E991 series

A purpose-built four-car set based directly on the 209-0 series design and classified E991 series was delivered to JR East's training center in Shirakawa, Fukushima in 2000 for internal training use. Externally, it is finished with green body stripes on unpainted stainless steel. It is not considered a 209 series variant. It cannot run on its own power and must be towed by a locomotive.

## MUE-Train

In October 2008, JR East unveiled the seven-car "MUE-Train" (MUltipurpose Experimental Train) experimental EMU converted from former Keihin–Tōhoku—Negishi Line 209 series set Ura 2. This set is used to test and develop new technology for use on future narrow-gauge trains. The train is based at Kawagoe Depot and began testing on the Utsunomiya Line from November 2008.

### Formation
#### 2008–2009

| Car No. | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Numbering | KuYa 208-2 | MoYa 208-4 | MoYa 209-4 | SaYa 209-8 | MoYa 208-3 | MoYa 209-3 | KuYa 209-2 |

#### 2010 onward

| Car No. | 1 | 2 | 3 | 5 | 6 | 7 |
| Numbering | KuYa 208-2 | MoYa 208-4 | MoYa 209-4 | MoYa 208-3 | MoYa 209-3 | KuYa 209-2 |
Cars 3 and 6 are each fitted with one PS33D single-arm pantograph.

## Accidents

On 8 May 2020, at 3:55 pm, the front carriage of a local service (6-car set C612) derailed between Awa-Kamogawa and Awa-Amatsu stations. Around 20 passengers and crew were on board the train when it derailed. One person was taken to a hospital.

## Preserved examples

* KuHa 901-1 (previously KuHa 209-901), at the Tokyo General Rolling Stock Center in Shinagawa.