Introduced:

Number in Class:    12

Jb Class Register

Locomotive Specifications

Builder:   North British, converted to oil burners by NZR

Engine Weight:    68.55 tons	Tender Weight:     40.35 tons	Total Weight:     108.9 tons	Adhesive Weight:     44.45 tons
Length over Buffers:     66' 11½"	Total Wheelbase:    58' 0"	Engine Wheelbase:     33' 1½"	Coupled Wheelbase:     14' 3"
Tender Wheelbase:     15' 10½"	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:	Oil Capacity:    1350 gals	Water Capacity:     4000 gals

Remarks:     Twelve 'J' class locomotives were comverted to oilburing and reclassified as Class 'Jb'. Refer to 'J' class Remarks for details.

Preserved Locomotive   Mainline Steam Trust,    Wellington -     Jb 1236,     North British #24559/1939