Preserved AB 778 hauling the Kingston Flyer in 2006.
Type and origin
Power type
Steam
Builder
NZGR Addington Workshops (38) North British Locomotive Company (83) A & G Price, Thames (20)
Build date
1915–1918, 1921–1927
Total produced
141
Specifications
Configuration:
• Whyte
4-6-2
Gauge
3 ft 6 in (1,067 mm)
Driver dia.
54 in (1.372 m)
Wheelbase
52 ft 6 in (16.00 m)
Length
62 ft 5 in (19.02 m)
Loco weight
51.3 long tons (52.1 tonnes; 57.5 short tons)
Tender weight
33.4 long tons (33.9 tonnes; 37.4 short tons)
Total weight
84.7 long tons (86.1 tonnes; 94.9 short tons)
Fuel type
Coal
Fuel capacity
4.0 long tons (4.1 tonnes; 4.5 short tons)
Water cap.
3,500 imp gal (16,000 L; 4,200 US gal)
Firebox:
• Grate area
33 sq ft (3.1 m2)
Boiler pressure
180 lbf/in2 (1.24 MPa)
Heating surface
1,148 sq ft (106.7 m2)
Superheater:
• Heating area
204 sq ft (19.0 m2)
Cylinders
Two, outside
Cylinder size
17 in × 26 in (432 mm × 660 mm)
Performance figures
Maximum speed
60 mph (97 km/h)
Tractive effort
20,030 lbf (89.10 kN)
Career
Operators
NZR
Numbers
608–838
Locale
All of New Zealand
First run
October 1915
Withdrawn
1963–1969
Preserved
7 (608, 663, 699, 745, 778, 795, 832)
Current owner
Kingston Flyer, Mainline Steam, Pleasant Point Museum and Railway, Museum of Transport and Technology, Ferrymead Railway, Rimutaka Incline Railway Heritage Trust.
Disposition
Seven preserved, two lost in a shipwreck off Great Barrier Island in 1922, remainder scrapped.
The NZR AB class was a class of 4-6-2 Pacific tender steam locomotive that operated on New Zealand's national railway system for New Zealand Railways (NZR). Originally an improvement on the 1906 A class, 141 were built between 1915 and 1927 by NZR's Addington Workshops, A & G Price of Thames, New Zealand, and North British Locomotive Company, making the AB class the largest class of steam locomotives ever to run in New Zealand.[1] An additional eleven were rebuilt from the tank version of the AB – the WAB class – between 1947 and 1957.[2] Two North British-made locomotives were lost in the wreck of the SS Wiltshire in May 1922.[3]
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