NZR R class

NZR R class
NZR R class on Jervois Quay, Wellington, circa 1900, on the Te Aro Branch.
Type and origin
Power typeSteam
BuilderAvonside Engine Co., England
Build date1878-79
Specifications
Configuration:
​
 • Whyte0-6-4T
Gauge3 ft 6 in (1,067 mm)
Driver dia.36.5 in (0.927 m)
Wheelbase21 ft 10 in (6.65 m)
Adhesive weight20 long tons (20.3 t; 22.4 short tons)
Loco weight33 long tons (33.5 tonnes; 37.0 short tons)
Firebox:​
 • Grate area11.8 sq ft (1.10 m2)
Boiler pressure160 lbf/in2 (1,103 kPa)
Heating surface556 sq ft (51.7 m2)
CylindersTwo, outside
Cylinder size12.25 in × 16 in (311 mm × 406 mm)
Performance figures
Maximum speed53 mph (85 km/h)
Tractive effort8,420 lbf (37.45 kN)
Career
OperatorsNew Zealand Railways Department
Number in class18
Disposition1 preserved

The NZR R class was a class of early 0-6-4T single Fairlie steam locomotives operated by New Zealand's Railways Department (NZR) between 1879 and 1936.

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