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NZR BB class information


NZR BB class
BB class 4-8-0 steam locomotive, NZR number 619, circa 1915. Godber Collection, Alexander Turnbull Library.
Type and origin
Power typeSteam
BuilderA & G Price, Thames, New Zealand[1]
Serial number63–92
Build date1915 (12), 1916 (8), 1917 (8), 1918 (2)
Specifications
Configuration:
 • Whyte4-8-0
 • UIC2'Dh
Gauge3 ft 6 in (1,067 mm)
Driver dia.42.5 in (1.080 m)
Length52 ft 7+12 in (16.04 m)
Adhesive weight32.5 long tons (33.0 t; 36.4 short tons)
Loco weight43.5 long tons (44.2 t; 48.7 short tons)
Tender weight25.5 long tons (25.9 t; 28.6 short tons)
Fuel typeCoal
Fuel capacity4 long tons (4.1 t; 4.5 short tons)
Water cap.1,700 imp gal (7,700 L; 2,000 US gal)
Firebox:
 • Grate area16.8 sq ft (1.56 m2)
Boiler pressure175 psi (1.21 MPa)
Heating surface724 sq ft (67.3 m2)
Superheater:
 • Heating area208 sq ft (19.3 m2)
CylindersTwo, outside
Cylinder size17 in × 22 in (432 mm × 559 mm)
Performance figures
Maximum speed40 mph (64 km/h)
Tractive effort20,940 lbf (93.1 kN)
Career
Number in class30
Numbers55, 109, 143, 144, 147, 167, 169, 171, 197, 222, 618–637
Preserved1 (BB 144)
DispositionOne preserved, remainder scrapped

The NZR BB class of steam locomotives comprised 30 engines operated by the New Zealand Railways (NZR) in the North Island of New Zealand. Ordered to replace smaller locomotives of several classes in the North Island, they were similar in design and appearance to the preceding B and BA classes. The first BB class locomotive entered service in February 1915, with the last to commence operations doing so on 8 March 1917. All were built by A & G Price Ltd of Thames, New Zealand, and as their cylinders had a larger diameter than the B and BA locomotives they were capable of generating more power to haul heavier trains. The most visible difference however was the roundtop firebox in place of the preceding classes Belpaire design. The BB class could haul up to 700 long tons (710 t; 780 short tons) of freight on a level railway line, though they were limited to a top speed of around 40 mph (64 km/h).

  1. ^ Palmer & Stewart 1965, p. 104.

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