Introduced: 1885

Number in Class: 6

O Class Register

Locomotive Specifications

Builder:   Baldwin Locomotive Works, Philadelphia, USA

Engine Weight:     29.5 tons	Tender Weight:     16.0 tons	Total Weight:    45.5 tons	Adhesive Weight:     25.2 tons
Length over Buffers:     46' 3"	Total Wheelbase:    39' 10"	Engine Wheelbase:    18' 9"	Coupled Wheelbase:     12' 4"
Tender Wheelbase:     12' 8"	Driver Wheel Dia.:    36"	Cylinders HP:     Two - 15" x 18"	Cylinders LP:
Grate Area:    15.2 sq ft	Evaporative Area:     908 sq ft	Superheated Area:	Working Pressure:     130 psig
Tractive Effort:     11700 lbs f	Coal Capacity:    1.8 tons	Oil Capacity:	Water Capacity:     1300 gals

Remarks:     These small locomotives proved that they were fond of hard work and were a substitute for the overweight Naysmith, Wilson 'P's. For several years they were used on goods train in the South Island, but between 1898 and 1902, they were transferred to the North Island for service on the Wairarapa and Napier lines. These engines had a rather exposed footplate, the boiler backhead was level with the back of the cab, so the fireman had to stand on the tender to fire.