The reference for locomotives and railcars


Page views since 2023-01-26: 422168
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
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 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
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
last changed: 08 2023

We use cookies to save the following settings:

  • selected navigation structure
  • selected language
  • preferred units
  • spelling of railway company names

If you refuse the use of cookies, the settings will only be retained for the current session and will be reset to the default values the next time you visit the site.

Display of units

Here you can set the desired unit system for the technical data.

  • Metric: Lengths in meters, weights in tonnes, and volumes in cubic meters
  • Imperial (UK): Lengths in feet/inches, weights in long tons and volumes in imperial gallons
  • Imperial (US): Lengths in feet/inches, weights in pounds, and volumes in US gallons
  • Individual: Depends on the country of origin of each locomotive
Operator names

Here you can set the display of railway company names.

  • Short: Abbreviation or short form of the name
  • Standard: commonly used name, partially translated to English
  • Complete: full name in local language