NZR DI class
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| Type and origin | |
|---|---|
| Power type | Diesel-Electric |
| Builder |
English Electric Rocklea works, Queensland, Australia |
| Build date | 1966 |
| Specifications | |
|---|---|
| Configuration: |
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| • UIC | Co-Co |
| Gauge | 3 ft 6 in (1,067 mm) |
| Length | 13.8 metres (45 ft 3 in) |
| Axle load | 10.16 tonnes (10.00 long tons; 11.20 short tons) |
| Adhesive weight | 61.0 tonnes (60.0 long tons; 67.2 short tons) |
| Loco weight | 61.0 tonnes (60.0 long tons; 67.2 short tons) |
| Prime mover | English Electric 6CSRKT |
| Aspiration | Turbocharged and Intercooled |
| Traction motors | Six English Electric 540/1A |
| Performance figures | |
|---|---|
| Maximum speed | 97 km/h (60 mph) |
| Power output | 755 kW (1,012 hp) |
| Tractive effort | 132 kN (30,000 lbf) |
| Career | |
|---|---|
| Number in class | 5 |
| Numbers | 1100 - 1104 (original) 1808 - 1843 (TMS) |
| Locale | All of New Zealand |
| First run | February 1966 |
| Last run | May 1989 |
| Disposition | 4 scrapped 1 preserved |
The New Zealand DI class locomotive was a class of diesel-electric locomotive in New Zealand. They were built by English Electric Australia. The class is very similar to the Queensland Railways 1620 class locomotives. At the time of their introduction, the class was seen as an alternative to the DB class for use on lightly laid secondary and branch lines, more so in the South Island, however the IMF financed introduction of the Japanese built DJ class in 1968 ensured that no further DI class locomotives were purchased by the Railways Department.
Three members of the class originally operated in the South Island, mainly on the Main North Line between Christchurch and Picton, while the other two members started life in the North Island. In 1969, all members were transferred to work in the Bay of Plenty area on the lightly laid track there. After the Kaimai Tunnel opened in 1978, all five members were transferred to the South Island for service in the Dunedin area. The class performed sterling service on the hilly Dunedin - Palmerston section of the Main South Line and were used to haul the Inch Valley branch line stone trains due to their full adhesion Co-Co wheel set arrangement. On occasions, members of the class made trips to Invercargill as the roster allocated and were used on the Otago Central Line as far as Ranfurly. They remained in Dunedin until 1984 - 1985, when they went north to Wellington and Napier. In their latter days the DI class was used mainly for shunting duties.
In February 1988, three members of the class were withdrawn. DI 1808 was withdrawn after a flash-over in its main generator, and was dismantled at Hutt Workshops in 1991. DI 1814 was withdrawn due to an unknown reason, while 1837 was withdrawn after throwing a conrod. 1843 was withdrawn in May 1989 after being damaged in a level crossing accident near Otaki.
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Wikipedia