NZR DF class (1954)

This article is about the locomotive first introduced in 1954. For the 1979 locomotive, see New Zealand DF class locomotive (1979).
New Zealand DF class (English Electric)
English Electric DF 1501 on display outside Sims-PMI in Otahuhu, Auckland. The locomotive has since moved to the Diesel Traction Group, Ferrymead Historic Park.
Type and origin
Power typeDiesel-electric
BuilderEnglish Electric, United Kingdom
Build date1954
Specifications
Configuration:
​
 • AAR2C-C2
 • UIC(2′Co)(Co2′)
 • Commonwealth2Co-Co2
Gauge3 ft 6 in (1,067 mm)
Wheel diameter3 ft 1 in (0.940 m)
Minimum curve297 ft (90.526 m)
Wheelbase52 ft 0 in (15.850 m) total, 12 ft 0 in (3.658 m) rigid
Length58 ft 0 in (17.678 m) over headstocks
Width8 ft 4 in (2.540 m)
Height11 ft 6 in (3.505 m)
Axle load11+3⁄4 long tons (11.9 t; 13.2 short tons)
Adhesive weight69 long tons (70 t)
Loco weight105 long tons (107 t; 118 short tons)
Fuel typeDiesel
Fuel capacity600 imp gal (2,700 L)
Prime moverEnglish Electric 12SVT Mk 2
RPM range750 - 850 rpm
Engine typefour stroke, four valves per cylinder
AspirationTurbocharged
GeneratorEnglish Electric 828A
Traction motorsSix English Electric 525/2A
Cylinders12 vee
Cylinder size10 in × 12 in (254 mm × 305 mm)
MU working110V, 10 notch electro-magnetic control
Loco brakeair, dynamic
Train brakesair
Performance figures
Maximum speed60 mph (97 km/h)
Power output1,500 hp (1,100 kW) gross, 1,370 hp (1,020 kW) net
Tractive effort38,500 lbf (171.3 kN) at 25% adhesion starting, 27,700 lbf (123.2 kN) at 16 mph (30 km/h) continuous
Career
Number in class10
Numbers1500 - 1509 (1954 to 1965)
1300 - 1309 (1965 to 1975)
LocaleNorth Island
First run1 July 1954
Last run21 June 1975
Disposition9 scrapped
1 preserved

The New Zealand DF class locomotive of 1954 was the first class of mainline diesel-electric locomotives built for New Zealand's national railway network, built by English Electric.

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