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J Class 4-8-2
CLASS  J    4-8-2


Introduced:    1939 Number in Class:    40

J Class Register




Locomotive Specifications

Builder:
  North British Locomotive Works, Glasgow, Scotland

Engine Weight:    
68.55 tons
Tender Weight:    
40.35 tons
Total Weight:    108.9 tons Adhesive Weight:    
44.45 tons
Length over Buffers:    
66' 11"
Total Wheelbase:    58' 0" Engine Wheelbase:    
33' 1"
Coupled Wheelbase:    
14' 3"
Tender Wheelbase:    
15' 10"
Driver Wheel Dia.:    54" Cylinders HP:    
Two - 18" x 26"
Cylinders LP:    
Grate Area:    39.0 sq ft Evaporative Area:    
1469 sq ft
Superheated Area:    
283 sq ft
Working Pressure:    
200 psig
Tractive Effort:    
24960 lbs f
Coal Capacity:    6.0 tons Oil Capacity:    1350 gals Water Capacity:    
4000 gals

Remarks:     Although the 'K's had proved most satisfactory on main lines laid with 70 lb per yard, or heavier rail, there was an urgent need for a modern, powerful locomotive capable or running over secondary lines laid with rails weighing only 53-56 lb per yard. Thus a new "Mountain" type locomotive was designed and classified 'J'. It was of handsome appearance, the boiler being partly streamlined after the style of the New Haven Railroad's 'J400' class 4-8-4s. To eliminate un-necessary weight, the coupling and connecting rods were forged from manganese molybdenum alloy steel. The 'J' incorporated all the latest ideas of the 'Ka' but a noteworthy departure was the use of the American Baker valve gear. The tender was of the Vanderbuilt ype. Twelve J class locomotives were converted to oil burning and reclassified as Class 'Jb', and the bullet nose streamlining was gradually removed. The 40 locomotives were all built by North British.

Preserved Locomotives
  Mainline Steam Trust,    Auckland -     J 1211,     North British #24534/1939   Restoring
  Glenbrook Vintage Railway,    Auckland -     J 1234,     North British #24557/1939   Operating
  Mainline Steam Trust,    Auckland -     J 1236,     North British #24559/1939   Restoring



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