# 121 series

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Japanese electric multiple unit train type

121 series 7200 series A pair of 121 series sets on the Yosan Line in May 2009 In service March 1987 – 2019 (as 121 series) April 2016 – present (as 7200 series) Manufacturers Hitachi, Kawasaki Heavy Industries, Kinki Sharyo, Tokyu Car Corporation Replaced 121 series (until 2019) Constructed 1986–1987 Refurbished 2016–2019 Number built 38 vehicles (19 sets) Number in service 38 vehicles (19 sets) Formation 2 cars per trainset Operators 121 series: JNR (1987) JR Shikoku (1987–2019) 7200 series: JR Shikoku (2016–present) Depot Takamatsu Lines served Dosan Line, Yosan Line Specifications Car body construction Stainless steel Car length 20,000 mm (65 ft 7 in) Width 2,800 mm (9 ft 2 in) Height 3,670 mm (12 ft 0 in) Floor height 1,180 mm (3 ft 10 in) Doors 3 pairs per side Maximum speed 100 km/h (62 mph) Traction system 121 series: Resistor control 7200 series: Toyo S-CS63A IGBT-VVVF Traction motors MT55A (121 series) S-MT64 (7200 series) Power output 121 series: 110 kW x 4 7200 series: 140 kW x 4 Acceleration 2.0 km/(h⋅s) (1.2 mph/s) Electric systems 1,500 V DC (overhead catenary) Current collection Pantograph Bogies 121 series: DT33A (motored) DT12T (trailer) 7200 series: S-DT67ef (motored) S-TR67ef (trailer) Multiple working 7200 series: 7000 series Track gauge 1,067 mm (3 ft 6 in)

The **121 series** (121系) is an [electric multiple unit](/source/Electric_multiple_unit) (EMU) train type introduced in March 1987 by [Japanese National Railways](/source/Japanese_National_Railways) (JNR), and currently operated by [Shikoku Railway Company](/source/Shikoku_Railway_Company) (JR Shikoku) on local services in [Shikoku](/source/Shikoku), Japan, as the 7200 series.[1][2]

## Design

The 121 series design was based on the earlier [105 series](/source/105_series), with lightweight stainless steel bodies.[3]

The motor bogies were the same DT33A bogies as used on the JNR-era [103 series](/source/103_series) EMUs, and the trailer cars used DT21T bogies recovered from withdrawn [101 series](/source/101_series) EMUs.[4] The [pantographs](/source/Pantograph_(rail)) were also recovered from withdrawn 101 series EMUs.[4]

		- A DT21T trailer bogie

## Operations

The sets are based at [Takamatsu](/source/Takamatsu%2C_Kagawa) Depot and operate on the [Yosan Line](/source/Yosan_Line) and [Dosan Line](/source/Dosan_Line) in 2-, 4-, or 6-car formations.[2][5]

## Formations

In 2019 the fleet consisted of 18 two-car 121 series sets and one 7200 series formed of one motored "Mc" car and one non-powered "Tc" trailer car as shown below with the motored "Mc" cars at the Takamatsu end.[5]

As of December 2024, the 7200 series trains were being used for stopping and rapid services on the Dosan Line (Tadotsu - Kotohira) and the Yosan Line (Takamatsu - Iyo-Saijo). Some of the services consist of three or four coaches with 7000 series.[6]

### 121 series

Designation Mc Tc Numbering KuMoHa 121 KuHa 120 Weight (t) 42.0 28.0 Capacity (total/seated) 118/62 118/62

The "Mc" cars are each fitted with one S-PS58 lozenge-type pantograph.[5]

		- KuMoHa 121-14 in December 2007

		- KuHa 120-14 in December 2007

### 7200 series

Designation Mc Tc Numbering KuMoHa 7200 KuHa 7300 Weight (t) 37.6 28.5 Capacity (total/seated) 132/52 132/52

The "Mc" cars are each fitted with one S-PS58 lozenge-type pantograph.[7]

		- 7218 in January 2019

		- 7318 in January 2019

## Interiors

Seating is arranged as a mix of transverse seating bays and longitudinal bench seats.[2] The sets are not equipped with toilets.[5]

		- An interior view in September 2007

## History

The 121 series sets were introduced on 23 March 1987, just nine days before JNR was privatised on 1 April, following which the 121 series fleet came under control of JR Shikoku.[4] The sets were originally delivered with magenta "Red No. 20" bodyside stripes, but were repainted with JR Shikoku corporate light blue ("Blue No. 26") bodyside stripes during September and October 1987.[2]

In 1992, the original pantographs were replaced with the same S-PS58 type pantographs also used on the [JR Shikoku 7000 series](/source/JR_Shikoku_7000_series) EMUs to ensure adequate clearance through tunnels on newly electrified sections of the [Yosan Line](/source/Yosan_Line).[4]

In 2011, two sets (numbers 001 and 002) were modified for *wanman* [driver only operation](/source/Driver_only_operation). These sets were repainted with their original JNR-style magenta bodyside stripes.[5]

		- 121 series sets in original JNR livery, circa 1987

		- Set 009 with a front-end red warning stripe added for a short period during the 1990s

		- A pair of 121 series sets in May 2009

		- Modified driver-only set 001 in April 2012

## Refurbishment and conversion

7200 series set R10 in September 2018

From 2016 to 2018, the entire fleet of 19 two-car trainsets underwent refurbishment, and then were reclassified as the "7200 series" (see fleet history, below). Refurbishment included replacement of the DC motors with 140 kW AC motors and VVVF control, new side windows, new "efWing" [CFRP](/source/Carbon-fiber-reinforced_polymer) bogies (S-DT67ef motor bogies and S-TR67ef trailer bogies), and a new livery based on the original style with a thin green line added to the magenta bodyside stripe.[7] Internally, the refurbished trains have fixed four-person seating bays on one side with longitudinal bench seating on the other.[7]

The first trainset to be treated, set 3, departed the JR Shikoku's Tadotsu Works in February 2016,[8] and entered service from 13 June 2016.[9]

		- An S-DT67ef motor bogie on car KuMoHa 7203

		- An S-TR67ef trailer bogie on car KuHa 7303

		- Inside the car

		- Wheelchair space

		- Driver's cab

## Fleet history

The individual build histories for the fleet are as follows.[4]

Set No. Manufacturer Date delivered 7200 series conversion date 001 Hitachi 17 November 1986 12 October 2018 002 Kinki Sharyo 20 November 1986 18 February 2019 003 Kawasaki Heavy Industries 13 December 1986 15 March 2016 004 9 September 2016 005 Kinki Sharyo 27 December 1986 28 March 2017 006 20 February 2018 007 7 November 2017 008 Tokyu Car 27 January 1987 5 June 2017 009 28 February 2017 010 22 August 2018 011 28 December 2017 012 Hitachi 13 January 1987 2 July 2018 013 27 January 1987 28 October 2016 014 6 December 2016 015 Kawasaki Heavy Industries 16 January 1987 13 September 2017 016 18 January 2017 017 20 July 2017 018 Kinki Sharyo 20 January 1987 11 December 2018 019 28 March 2018

## References

Wikimedia Commons has media related to [JNR 121](https://commons.wikimedia.org/wiki/Category:JNR_121).

1. **[^](#cite_ref-haraguchi2009_1-0)** Haraguchi, Takayuki (2009). *Jr全車両: ビジュアル決定版* Encyclopedia of JR's Railway Cars: ＪＲ全車輌. Japan: Sekai Bunka. p. 75. [ISBN](/source/ISBN_(identifier)) [978-4-418-09905-4](https://en.wikipedia.org/wiki/Special:BookSources/978-4-418-09905-4).

1. ^ [***a***](#cite_ref-neko2009_2-0) [***b***](#cite_ref-neko2009_2-1) [***c***](#cite_ref-neko2009_2-2) [***d***](#cite_ref-neko2009_2-3) *Jēāru zensharyō handobukku: Rail Magazine 2009* JR全車輌ハンドブック2009 [*JR Rolling Stock Handbook 2009*]. Japan: Neko Publishing. 2009. p. 256. [ISBN](/source/ISBN_(identifier)) [978-4-7770-0836-0](https://en.wikipedia.org/wiki/Special:BookSources/978-4-7770-0836-0).

1. **[^](#cite_ref-railfan664_1_3-0)** Fukuhara, Shunichi (August 2016). 121系近郊形直流電車のあゆみ part1 [The history of the 121 series suburban DC EMU trains (part 1)]. *[Japan Railfan Magazine](/source/Japan_Railfan_Magazine)* (in Japanese). Vol. 56, no. 664. Japan: Koyusha Co., Ltd. pp. 84–87.

1. ^ [***a***](#cite_ref-railfan665_4-0) [***b***](#cite_ref-railfan665_4-1) [***c***](#cite_ref-railfan665_4-2) [***d***](#cite_ref-railfan665_4-3) [***e***](#cite_ref-railfan665_4-4) Fukuhara, Shunichi (September 2016). 121系近郊形直流電車のあゆみ part2 [The history of the 121 series suburban DC EMU trains (part 2)]. *[Japan Railfan Magazine](/source/Japan_Railfan_Magazine)* (in Japanese). Vol. 56, no. 665. Japan: Koyusha Co., Ltd. pp. 94–99.

1. ^ [***a***](#cite_ref-jrr2016_summer_5-0) [***b***](#cite_ref-jrr2016_summer_5-1) [***c***](#cite_ref-jrr2016_summer_5-2) [***d***](#cite_ref-jrr2016_summer_5-3) [***e***](#cite_ref-jrr2016_summer_5-4) *Jr電車編成表* JR電車編成表 2016夏 [*JR EMU Formations - Summer 2016*] (in Japanese). Japan: Kotsu Shimbunsha. 20 May 2016. p. 205. [ISBN](/source/ISBN_(identifier)) [978-4-330-68216-7](https://en.wikipedia.org/wiki/Special:BookSources/978-4-330-68216-7).

1. **[^](#cite_ref-6)** ["JR Shikoku 7200 series - The Red List of Trains in Japan"](https://bateman.monologue.jp/en/articles/JR/jrs7200.html). *bateman.monologue.jp*. Retrieved 20 April 2025.

1. ^ [***a***](#cite_ref-railfan664_7-0) [***b***](#cite_ref-railfan664_7-1) [***c***](#cite_ref-railfan664_7-2) Yoshimoto, Eizaburo (August 2016). 7200系近郊形直流電車 [7200 series suburban DC EMU trains]. *[Japan Railfan Magazine](/source/Japan_Railfan_Magazine)* (in Japanese). Vol. 56, no. 664. Japan: Koyusha Co., Ltd. pp. 84–87.

1. **[^](#cite_ref-railfan20160203_8-0)** [JR四国121系第3編成が7200系となり出場](http://railf.jp/news/2016/02/03/160000.html) [JR Shikoku 121 series set 3 outshopped as 7200 series]. *Japan Railfan Magazine Online* (in Japanese). Japan: Koyusha Co., Ltd. 3 February 2016. Retrieved 12 May 2016.

1. **[^](#cite_ref-railfan201606143_9-0)** [JR四国7200系が営業運転を開始](http://railf.jp/news/2016/06/14/180000.html) [JR Shikoku 7200 series enters revenue service]. *Japan Railfan Magazine Online* (in Japanese). Japan: Koyusha Co., Ltd. 14 June 2016. Retrieved 14 June 2016.

v t e Electric multiple units of Japanese National Railways DC commuter/suburban 12 63 70 72 101 103 105 111 113 115 117 119 121 123 201 203 205 207 211 213 301 DC express/limited express 52 80 151 153 155 157 159 161 165 167 169 181 183 185 187 189 381 AC/DC commuter/suburban 401 403 411 413 415 417 419 421 423 AC/DC express/limited express 451 453 455 457 471 473 475 481 483 485 487 489 581 583 AC commuter/suburban 711 713 715 717 AC limited express 781 Non-revenue/experimental 141 143 145 147 191 193 443 495 591 791 This list shows all JNR EMUs, both active and withdrawn. Shinkansen types are omitted.

v t e Multiple units of Shikoku Railway Company Current / active EMUs 5000 6000 7000 7200 8000 8600 DMUs KiHa 32 KiHa 40 KiHa 54 KiHa 185 1000 1200 1500 2000 2600 2700 3600 Retired / withdrawn EMU 111 113 121 DMUs KiHa 20 KiHa 30 KiHa 35 KiHa 45 KiHa 52 KiHa 57 KiHa 58 KiHa 65 KiHa 181

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Adapted from the Wikipedia article [121 series](https://en.wikipedia.org/wiki/121_series) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/121_series?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.