NZR O class

Type and origin
Power type	Steam
Builder	Baldwin Locomotive Works
Serial number	7565–7569, 7572 (not in engine number order)
Build date	1885

Specifications
Configuration	2-8-0
Gauge	3 ft 6 in (1,067 mm)
Driver dia.	36.25 in (0.921 m)
Length	46 ft 3 in (14.10 m)
Adhesive weight	25.2 long tons (25.6 tonnes; 28.2 short tons)
Total weight	45.5 long tons (46.2 t; 51.0 short tons)
Firebox: • Firegrate area	15.2 sq ft (1.41 m²)
Boiler pressure	130 lbf/in² (896 kPa)
Heating surface	908 sq ft (84.4 m²)
Cylinders	Two, outside
Cylinder size	15 in × 18 in (381 mm × 457 mm)

Performance figures
Tractive effort	10,055 lbf (44.73 kN)

Career
Operators	New Zealand Government Railways
Number in class	6
Numbers	31, 54, 59, 98-100
Retired	May 1922

The O class consisted of six steam locomotives that operated on New Zealand's national rail network. Ordered from the Baldwin Locomotive Works of Pennsylvania in 1885, three arrived in time to begin work in December 1885, while two more were placed in service in January 1886 and the sixth in February 1886. After almost four decades of service, all six were withdrawn in May 1922. None survived to be preserved, although two engine frames and 5 tenders from O class locomotives are known to exist near Summit on the former Rimutaka Incline.

External links

Rail vehicles of New Zealand

Diesel locomotives

Diesel Multiple Units

Electric locomotives

1500 V DC	E^A (later EO of 1968) E^C E^D E^O of 1923 E^W

25 kV AC	EF

Battery	E E^B

Electric Multiple Units

1500 V DC (Wellington)	"English Electric" D^M (inc. D trailers) "Ganz Mavag" EM (inc. ET trailers) "Matangi" FP (inc. FT trailers)

25 kV AC (Auckland)	AM (inc. AMP, AMT, AMA)

Railcars

RM class	88 seater (also known as Fiats or twinsets) Clayton steam railcar Edison battery-electric railcar Midland railcar Leyland experimental petrol railcar MacEwan-Pratt petrol railcar Model T Ford railcar Sentinel-Cammell steam railcar Silver Fern Standard Thomas Transmission Vulcan Wairarapa Westinghouse

Others	A 88 Buckhurst petrol carriage

Steam locomotives

A of 1873
A of 1906 (inc. A^D)
A^A
A^B
B of 1874
B of 1899
B^A
B^B
B^C
C of 1873
C of 1930
D of 1874
D of 1929
E of 1872 & 1875
E of 1906
F
F^A (inc. F^B)
G of 1874
G Garratt of 1928 (inc. Pacific rebuild)
H
J of 1874
J of 1939
J^A
J^B
K of 1877
K of 1932
K^A
K^B
L
L^A
M
N
N^A
N^C
O
O^A
O^B
O^C
P of 1876
P of 1885
Q of 1878
Q of 1901
R
S
T
U
U^A
U^B
U^C
U^D
V
W
W^A
W^AB
W^B
W^D
W^E
W^F
W^G
W^H
W^J
W^S
W^W
X
Y

Locomotive hauled carriages

See also: Locomotives of New Zealand.

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