| Class ED73 | |
| Powertype: | Electric |
| Builder: | Toshiba |
| Builddate: | 1962 - 1963 |
| Totalproduction: | 22 |
| Uicclass: | Bo-Bo |
| Bogies: | DT119B |
| Wheeldiameter: | 11202NaN2 |
| Length: | 14400frac=8NaNfrac=8 |
| Width: | 2805frac=8NaNfrac=8 |
| Height: | 4260frac=8NaNfrac=8 |
| Electricsystem: | 20 kV AC at 50/60 Hz overhead wire |
| Collectionmethod: | Pantograph |
| Tractionmotors: | MT52 |
| Operator: | JNR |
| Fleetnumbers: | ED73 1–22, ED73 1001–1022 |
| Locale: | Kyushu |
| Deliverydate: | 1962 |
| Firstrundate: | 1962 |
| Retiredate: | 1980-1983 |
| Preservedunits: | 0 |
| Scrapdate: | 1980-1983 |
| Disposition: | All Scrapped |
The 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]
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 3m (10feet) 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.
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The class was withdrawn by the early 1980s.[1] No examples of the class have been preserved.[3]
See main article: Japan Railways locomotive numbering and classification.
The ED73 classification for this locomotive type is explained below.