121 series

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121 series
JNR 121 series 04.jpg
121 series on the Yosan Line, May 2009
In service 1987–
Manufacturer Hitachi, Kawasaki Heavy Industries, Kinki Sharyo, Tokyu Car Corporation
Refurbishment 2011–
Number built 38 vehicles (19 sets)
Number in service 38 vehicles (19 sets)
Formation 2 cars per trainset
Operator(s) JNR (1987)
JR Shikoku (1987–)
Depot(s) Takamatsu
Line(s) served Dosan Line, Yosan Line
Car body construction Stainless steel
Car length 20,000 mm (65 ft 7 in)
Width 2,870 mm (9 ft 5 in)
Height 4,086 mm (13 ft 4.9 in)
Doors 3 pairs per side
Maximum speed 100 km/h (60 mph)
Traction system MT55A traction motors
Power output 110 kW x 4
Electric system(s) 1,500 V DC overhead
Current collection method Overhead catenary
Bogies DT33A (motored)
DT12T (trailer)
Track gauge 1,067 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]


The 121 series design is based on the earlier 105 series, with lightweight stainless steel bodies.[1]


The sets are based at Takamatsu Depot and operate on the Yosan Line and Dosan Line in 2-, 4-, or 6-car formations.[2][3]


The 2-car sets are formed as shown below with the motored "Mc" cars at the Takamatsu end.[2][3]

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.[3]


Seating is arranged as a mix of transverse seating bays and longitudinal bench seats.[2] The sets are not equipped with toilets.[3]


The 121 series sets were introduced from 23 March 1987.[2] 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 following privatization of JNR.[2]

From November 2011, work commenced to modify sets for wanman driver only operation. These sets were repainted with their original JNR-style magenta bodyside stripes.[3]


  1. ^ a b Haraguchi, Takayuki (2009). 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 e f 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. ^ a b c d e JR電車編成表 2012冬 [JR EMU Formations - Winter 2012]. Japan: JRR. October 2011. p. 203. ISBN 978-4-330-25611-5.