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Wg Class
CLASS  Wg    4-6-4 T

Introduced: 1910 Number in Class: 20

Wg Class Register

Locomotive Specifications

   NZR Hillside

Engine Weight:    50.0 tons Tender Weight:     Total Weight:    50.0 tons Adhesive Weight:    
29.7 tons
Length over Buffers:    
36' 10"
Total Wheelbase:    29' 7" Engine Wheelbase:     29' 7" Coupled Wheelbase:    
10' 0"
Tender Wheelbase:     Driver Wheel Dia.:    45" Cylinders HP:    
Two - 14" x 22"
Cylinders LP:    
Grate Area:    16.9 sq ft Evaporative Area:    
738 sq ft
Superheated Area:     Working Pressure:    
200 psig
Tractive Effort:    
15330 lbs f
Coal Capacity:    2.0 tons Oil Capacity:     Water Capacity:    
1400 gals

Remarks:     These engines were designed to meet the need for a more powerful locomotive to haul suburban trains at Auckland and Wellington. They had a decided family likeness to the 'Wf' and were indeed an improved version with cylinders of the same dimensions, coupled wheels of the same diameter, and the same working pressure and tractive effort. With greater adhesion weight and larger water tanks, the 'Wg' was a useful engine and the class saw much main-line service as well as suburban work. Fitted with a "Coles" trailing truck. Ten were altered to 'Ww' old style, four rebuilt with high pitched boiler to 'Ww' style, and eight were superheated.