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G Class 4-6-2
CLASS  G     4-6-2

Introduced: 1937 Number in Class: 6

G Class Register

Locomotive Specifications

  NZR Hillside

Engine Weight:    
60.95 tons
Tender Weight:    
37.55 tons
Total Weight:    98.5 tons Adhesive Weight:    
41.25 tons
Length over Buffers:    
64' 5"
Total Wheelbase:    
54' 10"
Engine Wheelbase:    31' 0" Coupled Wheelbase:    
10' 9"
Tender Wheelbase:    
14' 0"
Driver Wheel Dia.:    57" Cylinders HP:    
Three - 16" x 24"
Cylinders LP:    
Grate Area:    36.5 sq ft Evaporative Area:    
1175 sq ft
Superheated Area:    
183 sq ft
Working Pressure:    
200 psig
Tractive Effort:    
25800 lbs f
Coal Capacity:    4.5 tons Oil Capacity:     Water Capacity:    
3700 gals

Remarks:     In 1937 the three ill-fated Garratts were dismantled and certain portions incorporated into six 'G' class three-cylinder Pacifics. The engines were provided with an 'Ab' boiler, a new roller bearing trailing truck was fitted, also a new cab, and the Vanderbuilt tender of similar design to that of the 'Ab' although larger and of all-welded construction. All bogies on the engine and tender were equipped with roller bearings, and other modern equipment included power reversing gear and exhaust-steam injectors. The three cylinders retained their conjugated valve gear from the Garrats, but this gear was rather light in construction and gave persistent trouble in maintaining the correct settings. The locomotives were used in the South Island mainly on the Christchurch to Arthur's Pass section and mainly in freight service. The class was far from popular and their shortcomings far too numerous to justify the high cost of major improvements. All were written off by 1956.