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Specifications
Specifications
Configuration:;
• UIC	Bo-Bo
Gauge	1,067 mm (3 ft 6 in)
Bogies	DT119B
Wheel diameter	1,120 mm (44.09 in)
Length	14,400 mm (47 ft 2+7⁄8 in)
Width	2,805 mm (9 ft 2+3⁄8 in)
Height	4,260 mm (13 ft 11+3⁄4 in)
Loco weight	67.2 t; (66.1 long tons; 74.1 short tons)
Electric system/s	20 kV AC at 50/60 Hz overhead wire
Current pickup(s)	Pantograph
Traction motors	MT52

Type and origin
Type and origin
Power type	Electric
Builder	Toshiba
Build date	1962 - 1963
Total produced	22

Class ED73
Class ED73
	The first locomotive delivered, ED73 1, in 1962
Power type
Type and origin
Power type	Electric
Builder	Toshiba
Build date	1962 - 1963
Total produced	22
Configuration:;
Specifications
Configuration:;
• UIC	Bo-Bo
Gauge	1,067 mm (3 ft 6 in)
Bogies	DT119B
Wheel diameter	1,120 mm (44.09 in)
Length	14,400 mm (47 ft 2+7⁄8 in)
Width	2,805 mm (9 ft 2+3⁄8 in)
Height	4,260 mm (13 ft 11+3⁄4 in)
Loco weight	67.2 t; (66.1 long tons; 74.1 short tons)
Electric system/s	20 kV AC at 50/60 Hz overhead wire
Current pickup(s)	Pantograph
Traction motors	MT52
Power output
Performance figures
Power output	1,900 kW (2,500 hp)
Operators
Career
Operators	JNR
Numbers	ED73 1–22, ED73 1001–1022
Locale	Kyushu
Delivered	1962
First run	1962
Retired	1980-1983
Preserved	0
Scrapped	1980-1983
Disposition	All Scrapped

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]

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

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

^ ^a ^b ^c ^d ^e ^f ^g 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.
^ ^a ^b 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.
^ 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.