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New Zealand Railways class AB
New Zealand | 1915 | 141 produced
Preserved No. 778 in January 2012 at the Kingston turntable
Preserved No. 778 in January 2012 at the Kingston turntable
Bernard Spragg
General
Built1915-1927
ManufacturerAddington, North British, A & G Price
Axle config4-6-2 (Pacific) 
Gauge3 ft 6 in (Cape gauge)
Dimensions and Weights
Length62 ft 5 in
Wheelbase27 ft 1 in
Fixed wheelbase10 ft
Total wheelbase52 ft 6 in
Service weight114,912 lbs
Adhesive weight66,976 lbs
Total weight189,728 lbs
Axle load25,312 lbs
Water capacity4,203 us gal
Fuel capacity8,960 lbs (coal)
Power
Power sourcesteam
Estimated power1,100 hp (820 kW)
Optimal speed33 mph
Top speed60 mph
Starting effort21,290 lbf
Power Plant
Driver diameter54 in
Boiler pressure180 psi
Expansion typesimple
Cylinderstwo, 17 x 26 in
Boiler
Grate area33 sq ft
Firebox area115 sq ft
Tube heating area1,033 sq ft
Evaporative heating area1,148 sq ft
Superheater area204 sq ft
Total heating area1,352 sq ft
Calculated Values
steam locomotive
passenger
last changed: 08 2023
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