JNR Class ED73

Specifications
Configuration:;
• UIC	Bo-Bo
Gauge	1,067 mm (3 ft 6 in)
Bogies	DT119B
Wheel diameter	1,120 mm (3 ft 8 in)
Length	14,400 mm (47 ft 3 in)
Width	2,805 mm (9 ft 2.4 in)
Height	4,260 mm (14 ft 0 in)
Loco weight	67.2 t
Electric system/s	20 kV AC, 60 Hz
Current pickup(s)	overhead wire
Traction motors	MT52

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

Class ED73
	The first locomotive delivered, ED73 1, in 1962
Type and origin
Power type	Electric
Builder	Toshiba
Build date	1962 - 1963
Total produced	22
Specifications
Configuration:;
• UIC	Bo-Bo
Gauge	1,067 mm (3 ft 6 in)
Bogies	DT119B
Wheel diameter	1,120 mm (3 ft 8 in)
Length	14,400 mm (47 ft 3 in)
Width	2,805 mm (9 ft 2.4 in)
Height	4,260 mm (14 ft 0 in)
Loco weight	67.2 t
Electric system/s	20 kV AC, 60 Hz
Current pickup(s)	overhead wire
Traction motors	MT52
Performance figures
Power output	1,900 kW
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The class was withdrawn by the early 1980s.[1] No examples of the class have been preserved.[3]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

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.
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.

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[inoue1999-1] 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.

[railfan19-2] 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.

[sasada2012-3] 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.