JNR Class ED73

The Class ED73 (ED73形) was a Bo-Bo wheel arrangement AC electric locomotive type operated by Japanese National Railways (JNR) in Kyushu, Japan, between 1962 and the 1980s.[1]

Class ED73
Monochrome side view of locomotive number ED73 1
The first locomotive delivered, ED73 1, in 1962
Type and origin
Power typeElectric
BuilderToshiba
Build date1962 - 1963
Total produced22
Specifications
Configuration:
​
 • UICBo-Bo
Gauge1,067 mm (3 ft 6 in)
BogiesDT119B
Wheel diameter1,120 mm (44.09 in)
Length14,400 mm (47 ft 2+7⁄8 in)
Width2,805 mm (9 ft 2+3⁄8 in)
Height4,260 mm (13 ft 11+3⁄4 in)
Loco weight67.2 t
(66.1 long tons; 74.1 short tons)
Electric system/s20 kV AC at 50/60 Hz overhead wire
Current pickup(s)Pantograph
Traction motorsMT52
Performance figures
Power output1,900 kW (2,500 hp)
Career
OperatorsJNR
NumbersED73 1–22, ED73 1001–1022
LocaleKyushu
Delivered1962
First run1962
Retired1980-1983
Preserved0
Scrapped1980-1983
DispositionAll Scrapped

Design

The Class ED73 design was broadly derived from the Class ED72 locomotives introduced a year earlier, but as the Class ED73 was primarily intended for use on freight services, it did not include a steam generator for train heating, and was therefore 3 m (9 ft 10 in) shorter than the Bo-2-Bo wheel arrangement Class ED72.[1] The DT119B bogies were also almost identical to those used on the full-production Class ED72 locomotives.[2]

History

A total of 22 locomotives were built by Toshiba between 1962 and 1963.[1] The first locomotives were delivered to Moji Depot in northern Kyushu.[2]

In the late 1960s, the entire class was modified with improved braking performance for use on express freight services, and the locomotives were renumbered in the ED73 10xx series.[1] The locomotive numbers were painted yellow at this time.[1] In later years, the class was also used on overnight sleeping car services, as these trains did not require steam heating.[1]

The class was withdrawn by the early 1980s.[1] No examples of the class have been preserved.[3]

Classification
Main article: Japan Railways locomotive numbering and classification

The ED73 classification for this locomotive type is explained below.

  • E: Electric locomotive
  • D: Four driving axles
  • 7x: AC locomotive with maximum speed exceeding 85 km/h (55 mph)

References
Wikimedia Commons has media related to JNR ED73.
  1. Inoue, Koichi (1999). 国鉄機関車事典: 蒸気・電気・ディーゼル機関車66形式 国鉄機関車辞典 [JNR Locomotive Encyclopedia]. Japan: Sankaido. pp. 140–141. ISBN 978-4-381-10338-3.
  2. Tezuka, Kazuyuki (January 1963). 交流電気機関車ED731 [AC electric locomotive ED73 1]. Japan Railfan Magazine (in Japanese). Vol. 3, no. 19. Japan: Koyusha Co., Ltd. p. 14.
  3. Sasada, Masahiro (September 2012). 国鉄&JR保存車大全 [JNR & JR Preserved Rolling Stock Complete Guide]. Tokyo, Japan: Ikaros Publications Ltd. p. 126. ISBN 978-4863206175.
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