KiHa 122 series

The KiHa 122 series (キハ122系, Kiha-122-kei) and KiHa 127 series (キハ127系, Kiha-127-kei) are diesel multiple unit (DMU) train types operated by West Japan Railway Company (JR-West) on the Kishin Line between Himeji and Kōzuki. A total of 19 cars have been delivered, formed as seven single-car KiHa 122 series units and six two-car KiHa 127 series units.[2] Test-running commenced in late September 2008,[4] with the units entering revenue-earning service from the start of the revised timetable on 14 March 2009.[5]

KiHa 122/127 series
KiHa 127 series 2-car DMU at Himeji Station in March 2009
ManufacturerNiigata Transys[1]
Entered service2009
Number built19 vehicles
Number in service19 vehicles
FormationKiHa 122: Single car unit
KiHa 127: 2-cars per trainset
CapacityKiHa 122: 113 (33 seated)
KiHa 127: 268 (92 seated)
Line(s) servedKishin Line
Car body constructionStainless steel
Car length20,440 mm (KiHa 122)
20,270 mm (KiHa 127)
Width2,900 mm
Height4,040 mm
DoorsTwo pairs per side
Maximum speed100 km/h (60 mph)[2]
Prime mover(s)SA6D140HE-2[3]
Power output450 hp (at 2,100 rpm)[3]
Train heatingWAU707 x2
BogiesWDT65 (driving), WT248 (trailing)
Braking system(s)Engine brake, electronically controlled pneumatic brakes
Safety system(s)ATS-SW
Track gauge1,067 mm (3 ft 6 in)


The body design features improved crash resistance, based on the recent 223 series electric multiple unit design. The cars use environmentally-friendly diesel engines with reduced NOx and particulate emissions.[6]

Externally, the units are finished in unpainted metal with thin yellow and red waistline stripes.[4]


Internally, the cars feature flip-over reversible seating arranged 2+1 abreast. Toilets in both types of train are wheelchair-accessible, and the step between the passenger compartment and station platform has been eliminated.[6]


The KiHa 122 single-car units and KiHa 127 two-car units are formed as follows.[7]

KiHa 122 series (single-car unit)

The KiHa 122 series uses a diesel engine with a small lithium-ion battery (18 kWh) that is used to power auxiliary machines in the train.[8]

Designation cMc
Numbering KiHa 122-0
Weight (t) 40.5

(Equipped with toilet)

KiHa 127 series (2-car units)

Designation Mc1 Mc2
Numbering KiHa 127-0 KiHa 127-1000
Weight (t) 38.5 37.5
130/41 138/51

(KiHa 127-0 is equipped with a toilet.)



  1. キハ127+キハ122,網干へ回送 [KiHa 127 & 122 moved to Aboshi]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 2 October 2008. Retrieved 14 March 2012.
  2. JR西日本 キハ122形・キハ127形を姫新線に導入 [JR-West to introduce KiHa122/127 on Kishin Line]. Tetsudō Daiya Jōhō magazine. Vol. 37 no. 294. Japan: Kōtsū Shimbun. September 2008. p. 70.
  3. キハ122・127系 気動車 [KiHa 122/127 series DMU]. Japan Railfan Magazine. Vol. 49 no. 573. Japan: Kōyūsha Co., Ltd. January 2009. pp. 68–72.
  4. キハ127+キハ122が試運転 [KiHa 125 + KiHa 122 Test run]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 22 September 2008. Retrieved 14 March 2012.
  5. Yomiuri Shimbun: 新型高速ディーゼル登場姫新線 (15 March 2009). Retrieved on 18 March 2009 (in Japanese)
  6. キハ122、127系気動車の新製投入について [Introduction of new KiHa 122/127 series diesel cars]. Press Release (in Japanese). Japan: West Japan Railway Company. 26 August 2008. Archived from the original on 15 January 2009. Retrieved 14 March 2012.
  7. Nishiwaki, Kōji (January 2011). JR各社の新世代気動車の現況 JR西日本キハ122・127形 [The Current State of Modern JR DMUs - JR-West KiHa 122/127]. Japan Railfan Magazine. Vol. 51 no. 597. Japan: Kōyūsha Co., Ltd. pp. 108–110.
  8. Yamamoto, T. (2017). "Trends and Recent Studies on Hybrid Railway Vehicles". Quarterly Report of RTRI. 58 (1): 1–5. doi:10.2219/rtriqr.58.1_1.
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