Seibu Class E31

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Class E31
Seibu E34 Minami-Iriso 20070901.JPG
Seibu Class E31 electric locomotive No. E34 on display at Minami-Iriso Depot Open Day, September 2007
Type and origin
Power type Electric
Builder Seibu (Tokorozawa)
Build date 1986-1987
Total produced 4
 • UIC Bo-Bo
Gauge 1,067 mm (3 ft 6 in)
Electric system(s) 1,500 V DC
Traction motors DC
Performance figures
Power output 520 kW
Operators Ōigawa Railway
Disposition 3 transferred to Ōigawa Railway

The Class E31 is a class of DC Bo-Bo wheel arrangement electric locomotives formerly operated by the private railway operator Seibu Railway in Japan until March 2010 and subsequently by the Ōigawa Railway.

Four locomotives (numbered E31 to E34) were built at Seibu's Tokorozawa factory between 1986 and 1987 to replace ageing first-generation electric locomotives on freight services and track maintenance train duties. The DT-20A bogies were reused from former JNR 80 series EMUs, and the traction motors were modified from former EMU motors.

They were normally used in pairs by Seibu, top-and-tailing permanent way maintenance trains and to haul newly delivered rolling stock.

Locomotive number E33 was withdrawn on 31 January 2009, becoming the first of the class to be withdrawn.[1] The remaining three locomotives were withdrawn on 28 March 2010.[2]

A pair of Class E31 locomotives, including E34, stored on the Oigawa Railway in August 2014

In September 2010, three of the withdrawn Class E31 locomotives (E32 to E34) were transferred to the Ōigawa Railway to replace the ageing E10 and ED500 locomotives used there.[3] Initially they were used only for depot shunting duties, but from 2017 they underwent overhaul in preparation for use as helper locomotives on steam-hauled trains from fiscal 2018.[4]

Locomotive E31 remains preserved at Seibu's Yokoze Depot.

See also[edit]


Gotō, Fumio (January 2009). 西武鉄道 電気機関車小史2 [Short History of Seibu Electric Locomotives]. Japan Railfan Magazine (in Japanese). Vol. 49 no. 573. Japan: Koyusha. pp. 138–143. 

  1. ^ 私鉄車両のうごき [Private Railway Fleet Movements]. Tetsudō Daiya Jōhō (in Japanese). Japan: Kōtsū Shimbun. 38 (303): 124. July 2009. 
  2. ^ "西武鉄道 「E31形電気機関車 さよならイベント」を開催" [Seibu to stage "Class E31 Sayonara Event"]. Hobidas (in Japanese). Neko Publishing. 15 March 2010. Retrieved 15 March 2010. 
  3. ^ "大井川鉄道が西武E31形電機を導入!" [Ōigawa Railway introduces Seibu Class E31 Electric Locomotives]. Japan Railfan Magazine (in Japanese). Vol. 50 no. 596. Japan: Koyusha. December 2010. p. 143. 
  4. ^ 大井川鐵道、元西武E31形電気機関車営業デビューへ 2018年度中めざす [Oigawa Railway former Seibu Class E31 electric locomotives to enter revenue service in fiscal 2018] (in Japanese). Japan: Tetsudo Shimbun. 2 May 2017. Archived from the original on 3 May 2017. Retrieved 3 May 2017. 

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