121 series

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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)
ManufacturerHitachi, Kawasaki Heavy Industries, Kinki Sharyo, Tokyu Car Corporation
Replaced121 series (until 2019)
Constructed1986–1987
Refurbished2016–2019
Number built38 vehicles (19 sets)
Number in service38 vehicles (19 sets)
Formation2 cars per trainset
Operators121 series:
JNR (1987)
JR Shikoku (1987–2019)
7200 series:
JR Shikoku (2016–present)
DepotsTakamatsu
Lines servedDosan Line, Yosan Line
Specifications
Car body constructionStainless steel
Car length20,000 mm (65 ft 7 in)
Width2,800 mm (9 ft 2 in)
Height3,670 mm (12 ft 0 in)
Floor height1,180 mm (3 ft 10 in)
Doors3 pairs per side
Maximum speed100 km/h (62 mph)
Traction system
Traction motors
  • MT55A (121 series)
  • S-MT64 (7200 series)
Power output121 series:
110 kW x 4
7200 series:
140 kW x 4
Acceleration2.0 km/(h⋅s) (1.2 mph/s)
Electric system(s)1,500 V DC (overhead catenary)
Current collector(s)Pantograph
Bogies 121 series:
DT33A (motored)
DT12T (trailer)
7200 series:
S-DT67ef (motored)
S-TR67ef (trailer)
Multiple working 7200 series:
7000 series
Track gauge1,067 mm (3 ft 6 in)

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

Design[edit]

The 121 series design is based on the earlier 105 series, with lightweight stainless steel bodies.[3]

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the same DT33A bogies as used on the JNR-era 103 series EMUs, and the trailer cars used DT21T bogies recovered from withdrawn 101 series EMUs.[4] The pantographs were also recovered from withdrawn 101 series EMUs.[4]

  • A DT21T trailer bogie
    A DT21T trailer bogie

Operations[edit]

The sets are based at Takamatsu Depot and operate on the Yosan Line and Dosan Line in 2-, 4-, or 6-car formations.[2][5]

Formations[edit]

As of 1 April 2016, the fleet consists 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]

121 series[edit]

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
    KuMoHa 121-14 in December 2007
  • KuHa 120-14 in December 2007
    KuHa 120-14 in December 2007

7200 series[edit]

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.[6]

  • 7218 in January 2019
    7218 in January 2019
  • 7318 in January 2019
    7318 in January 2019

Interiors[edit]

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
    An interior view in September 2007

History[edit]

The 121 series sets were introduced on 23 March 1987, just nine days before JNR was privatized 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 EMUs to ensure adequate clearance through tunnels on newly electrified sections of the Yosan Line.[4]

In 2011, two sets (numbers 001 and 002) were modified for wanman 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
    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
    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
    A pair of 121 series sets in May 2009
  • Modified driver-only set 001 in April 2012
    Modified driver-only set 001 in April 2012

Refurbishment and conversion[edit]

7200 series set R10 in September 2018

From 2016, the entire fleet of 19 two-car trainsets is scheduled to undergo refurbishment, and at the same time reclassified "7200 series". Refurbishment includes replacement of the DC motors with 140 kW AC motors and VVVF control, new side windows, new "efWing" CFRP 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.[6] Internally, the refurbished trains have fixed four-person seating bays on one side with longitudinal bench seating on the other.[6]

The first trainset to be treated, set 3, was outshopped from JR Shikoku's Tadotsu Works in February 2016,[7] and entered service from 13 June 2016.[8]

  • An S-DT67ef motor bogie on car KuMoHa 7203
    An S-DT67ef motor bogie on car KuMoHa 7203
  • An S-TR67ef trailer bogie on car KuHa 7303
    An S-TR67ef trailer bogie on car KuHa 7303
  • Inside the car
    Inside the car
  • Wheelchair space
    Wheelchair space
  • Driver's cab
    Driver's cab

Fleet history[edit]

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[edit]

Wikimedia Commons has media related to JNR 121.
  1. ^ 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 978-4-418-09905-4.
  2. ^ a b c d 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 978-4-7770-0836-0.
  3. ^ 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 (in Japanese). Vol. 56, no. 664. Japan: Koyusha Co., Ltd. pp. 84–87.
  4. ^ a b c d e 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 (in Japanese). Vol. 56, no. 665. Japan: Koyusha Co., Ltd. pp. 94–99.
  5. ^ a b c d e 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 978-4-330-68216-7.
  6. ^ a b c Yoshimoto, Eizaburo (August 2016). 7200系近郊形直流電車 [7200 series suburban DC EMU trains]. Japan Railfan Magazine (in Japanese). Vol. 56, no. 664. Japan: Koyusha Co., Ltd. pp. 84–87.
  7. ^ JR四国121系第3編成が7200系となり出場 [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.
  8. ^ JR四国7200系が営業運転を開始 [JR Shikoku 7200 series enters revenue service]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 14 June 2016. Retrieved 14 June 2016.
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