NZR DF class (1954)

New Zealand D^F class (English Electric)

English Electric D^F 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 type	Diesel-electric
Builder	English Electric, United Kingdom
Build date	1954

Specifications
Configuration:
• AAR	2C-C2
• UIC	(2′Co)(Co2′)
• Commonwealth	2Co-Co2
Gauge	3 ft 6 in (1,067 mm)
Wheel diameter	3 ft 1 in (0.940 m)
Minimum curve	297 ft (90.526 m)
Wheelbase	52 ft 0 in (15.850 m) total, 12 ft 0 in (3.658 m) rigid
Length	58 ft 0 in (17.678 m) over headstocks
Width	8 ft 4 in (2.540 m)
Height	11 ft 6 in (3.505 m)
Axle load	11+3⁄4 long tons (11.9 t; 13.2 short tons)
Adhesive weight	69 long tons (70 t)
Loco weight	105 long tons (107 t; 118 short tons)
Fuel type	Diesel
Fuel capacity	600 imp gal (2,700 L)
Prime mover	English Electric 12SVT Mk 2
RPM range	750 - 850 rpm
Engine type	four stroke, four valves per cylinder
Aspiration	Turbocharged
Generator	English Electric 828A
Traction motors	Six English Electric 525/2A
Cylinders	12 vee
Cylinder size	10 in × 12 in (254 mm × 305 mm)
MU working	110V, 10 notch electro-magnetic control
Loco brake	air, dynamic
Train brakes	air

Performance figures
Maximum speed	60 mph (97 km/h)
Power output	1,500 hp (1,100 kW) gross, 1,370 hp (1,020 kW) net
Tractive effort	38,500 lbf (171.3 kN) at 25% adhesion starting, 27,700 lbf (123.2 kN) at 16 mph (30 km/h) continuous

Career
Number in class	10
Numbers	1500 - 1509 (1954 to 1965) 1300 - 1309 (1965 to 1975)
Locale	North Island
First run	July 1954
Last run	21 June 1975
Disposition	9 scrapped 1 preserved

The New Zealand D^F 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. It should not be confused with General Motors Electro-Motive Division DF class of 1979.