NZR DI class

New Zealand DI Class
Type and origin
Power type Diesel-Electric
Builder English Electric
Rocklea works, Queensland, Australia
Build date 1966
Specifications
UIC classification Co-Co
Length 13.8 metres (45 ft 3 in)
Axle load 10.16 tonnes (10.00 long tons; 11.20 short tons)
Weight on drivers 61.0 tonnes (60.0 long tons; 67.2 short tons)
Locomotive 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
Number(s) 1100 - 1104 (original)
1808 - 1843 (TMS)
Locale All of New Zealand
First run 1966
Last run 1988 - 1989
Disposition Withdrawn
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.

Service

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.

Withdrawal and preservation

In 1988, three members of the class were written off following accidents. The remaining two locomotives were withdrawn by 1989, following the conversion of the DSC class shunting locomotives to right-hand control.

One member of the class, DI 1102 (1820) has been preserved by the Diesel Traction Group at Ferrymead.

Class register

Key: In service Out of service Auckland Transport service Preserved Overhaul/Repair Scrapped
TMS number Original number Introduced Withdrawn Notes
1808 1100 1966 1988 Written off in 1988 after flashover in main generator. Dismantled at Hutt Workshops in 1991.
1814 1101 1966 1988
1820 1102 1966 1989 Preserved, Diesel Traction Group.
1837 1103 1966 1988 Written off and scrapped in 1988 after throwing a conrod.
1843 1104 1966 1988 Written off and scrapped in 1988 after being damaged in a level crossing accident near Otaki.

References

External links