NZR ED class
ED 103 at Ferrymead
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| Type and origin | |
|---|---|
| Power type | Electric |
| Builder |
English Electric, UK (1), New Zealand Railways (Hutt Workshops - 7, Addington Workshops - 2) |
| Specifications | |
|---|---|
| UIC class | 1-Do-2 |
| Gauge | 1,067 mm (3 ft 6 in) |
| Length | 14.1 m (46 ft 3 in) |
| Loco weight | 89 short tons (81 t; 79 long tons) |
| Electric system(s) | 1,500 V DC overhead lines |
| Current collection | Pantograph |
| Performance figures | |
|---|---|
| Maximum speed | 88 km/h (55 mph), restricted to 70 km/h (43 mph) |
| Power output | 1 hour: 925 kW (1,240 hp), Continuous: 670 kW (898 hp) |
| Tractive effort | 80 kN (18,000 lbf) |
| Career | |
|---|---|
| Operators | New Zealand Railways |
| Number in class | 10 |
| Numbers | 101–110 TMS: 15, 21 |
| Locale | Wellington region |
| First run | 10 May 1938 |
| Last run | March 1981 |
| Disposition | 8 scrapped 2 preserved |
The New Zealand ED class locomotive was a class of electric locomotive used in Wellington, New Zealand. They were built by English Electric and the New Zealand Railways Department between 1938 and 1940, and hauled mainly passenger trains on the Wellington region's 1500 V DC electrification, and banked freight trains on the steep section between Paekakariki and Pukerua Bay.
The locomotives featured a unique wheel arrangement, 1-Do-2 under the UIC classification system, and incorporated a quill drive to the driving wheels.
They were found to be hard on the tracks, leading to speed restrictions on these locomotives and their replacement by EW class locomotives on the Johnsonville Line after the introduction of the EW in 1952. The EW was considered more suited to passenger services than the ED and replaced them on most passenger services on other lines.
Like all other electric locomotives in New Zealand, the leading letter of the locomotives' classification is E. There are two predominant theories about how the ED class acquired the second letter, D. The first is that it comes from the "Do" of its 1-Do-2 wheel arrangement. The second is from its original allocation to two locations, Wellington and Otira - Arthur's Pass, hence "duplicated". Official records provide no confirmation of either theory.
New Zealand Railways purchased one ED class locomotive in 1938 from English Electric, No. 101, for use on the newly opened Tawa Flat deviation, which incorporated two long tunnels. This locomotive was known as The Sergeant because of the three longitudinal stripes on each side of the body that were unique to this locomotive.
The success of this locomotive led to the importation of locomotive components from the United Kingdom for assembly in New Zealand. A further seven locomotives were assembled at the Hutt Workshops and two at Addington Workshops for use on the Otira - Arthur's Pass section of the Midland Line. These locomotives were later transferred north.
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Wikipedia