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NZR DG class
From Wikipedia, the free encyclopedia
| NZR DG / DH class | |
| Power type | Diesel-Electric |
|---|---|
| Builder | English Electric and Vulcan Foundry, United Kingdom |
| UIC classification | A1A - A1A |
| Length | 14.7 m |
| Total weight | 70t |
| Prime mover | EE 6SRKT Mk 2 |
| Top speed | 97 km/h |
| Power output | 560 kW / 750 hp |
| Tractive effort | 198 kN |
| Career | New Zealand Railways, Ferrymead, Weka Pass Railway |
| Number in class | DG: 31 DH:11 |
| Number | TMS numbers: 2007 - 2468 Early numbers: 750 - 791 |
| Locale | All of New Zealand |
| First run | 1955 - 1956 |
| Last run | 1983 |
| Disposition | 0 in service; 4 preserved |
The NZR DG and DH class locomotives were a class of diesel-electric locomotives in New Zealand. The class was introduced as an alternative to the DF class, being a 'half' version of the DF with only one cab instead of two. The South Island allocated locomotives were initially classified 'DH' because of their lower axle weight. However, DG locomotives from the North Island began operating in the South with the introduction of the Aramoana ferry in 1962. As a result, the DH class locomotives were converted to DG class standards in 1968. The DG class suffered from a number of defects, mainly relating to engine overheating. Thus with the introduction of the DJ class in 1968 the class was usually relegated to "slave" status. The introduction of the new DF class further displaced the class.
In an attempt to modernise the locomotives and extend their working lives, ten members of the DG class were rebuilt by Hillside Workshops between 1978 and 1980. The main cosmetic change was to the locomotives' cabs, which were extensively rebuilt. However, the class continued to be plagued by operational problems and were all withdrawn from service at the end of 1983.
Four locomotives have been preserved: two at the Weka Pass Railway and two by Ferrymead.