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Ww Class
CLASS  Ww    4-6-4 T

Introduced: 1913 Number in Class: 51

Ww Class Register

Locomotive Specifications

   NZR Addington (3)
   NZR Hillside (48)

Engine Weight:    51.5 tons Tender Weight:     Total Weight:    51.5 tons Adhesive Weight:    
29.7 tons
Length over Buffers:    
36' 11"
Total Wheelbase:    29' 7" Engine Wheelbase:    29' 7" Coupled Wheelbase:    
10' 0"
Tender Wheelbase:     Driver Wheel Dia.:    45" Cylinders HP:    
Two - 15" x 22"
Cylinders LP:    
Grate Area:    16.9 sq ft Evaporative Area:    
526 sq ft
Superheated Area:    
131 sq ft
Working Pressure:    
180 psig
Tractive Effort:    
16910 lbs f
Coal Capacity:    2.0 tons Oil Capacity:     Water Capacity:    
1370 gals

Remarks:     This class was a superheated version of the 'Wg'. Ten of the original 'Wg' class were reclassified as 'Ww' between 1940 and 1952. The two types were similar in appearance but the 'Ww' had larger cylinders and lower boiler pressure. Except for three engines allocated to the Westport section for coal haulage, all the 'Ww's were for many years employed in the North Island. They handled suburban services at Auckland and Wellington and also worked short-section main-line services. Ten rebuilt with high pitched boiler to new style in 1950-1960.

Preserved Locomotives
  Glenbrook Vintage Railway,    Auckland -     Ww 480,     NZR Hillside #104/1910   Operating
  Museum of Transport & Technology,    Auckland -     Ww 491,     NZR Hillside #116/1912   Display
  Silver Stream Railway,    Wellington -     Ww 571,     NZR Hillside #147/1914   Operating
  Glenbrook Vintage Railway,    Auckland -     Ww 644,     NZR Hillside #179/1915   Overhauling