| NZR AB class |
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| Specifications |
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Configuration:
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| • Whyte | 4-6-2 |
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| Gauge | 3 ft 6 in (1,067 mm) |
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| Driver dia. | 54 in (1.372 m) |
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| Wheelbase | 52 ft 6 in (16.00 m) |
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| Length | 62 ft 5 in (19.02 m) |
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| Loco weight | 51.3 long tons (52.1 tonnes; 57.5 short tons) |
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| Tender weight | 33.4 long tons (33.9 tonnes; 37.4 short tons) |
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| Total weight | 84.7 long tons (86.1 tonnes; 94.9 short tons) |
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| Fuel type | Coal |
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| Fuel capacity | 4.0 long tons (4.1 tonnes; 4.5 short tons) |
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| Water cap. | 3,500 imp gal (16,000 L; 4,200 US gal) |
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| Firebox: | |
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| • Grate area | 33 sq ft (3.1 m2) |
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| Boiler pressure | 180 lbf/in2 (1.24 MPa) |
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| Heating surface | 1,148 sq ft (106.7 m2) |
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Superheater:
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| • Heating area | 204 sq ft (19.0 m2) |
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| Cylinders | Two, outside |
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| Cylinder size | 17 in × 26 in (432 mm × 660 mm) |
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| Performance figures |
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| Maximum speed | 60 mph (97 km/h) |
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| Tractive effort | 20,030 lbf (89.10 kN) |
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| Career |
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| Operators | NZR |
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| Numbers | 608–838 |
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| Locale | All of New Zealand |
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| First run | October 1915 |
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| Withdrawn | 1963–1969 |
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| Preserved | 7 (608, 663, 699, 745, 778, 795, 832) |
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| Current owner | Kingston Flyer, Mainline Steam, Pleasant Point Museum and Railway, Museum of Transport and Technology, Ferrymead Railway, Rimutaka Incline Railway Heritage Trust. |
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| Disposition | Seven preserved, two lost in a shipwreck off Great Barrier Island in 1922, remainder scrapped. |
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The NZR AB class are 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.
