NZR OA class

NZR O^A class

Type and origin
Power type	Steam
Builder	Baldwin Locomotive Works
Serial number	13908
Build date	1894

Specifications
Configuration	2-8-0
Gauge	3 ft 6 in (1,067 mm)
Driver dia.	43 in (1.092 m)
Length	51 ft 8 in (15.75 m)
Adhesive weight	33.7 long tons (34.2 t)
Total weight	57.4 long tons (58.3 t; 64.3 short tons)
Fuel type	Coal
Firebox: • Firegrate area	16.7 sq ft (1.55 m²)
Boiler pressure	180 psi (1,241 kPa)
Heating surface	1,050 sq ft (98 m²)
Cylinders	four, Vauclain
High-pressure cylinder	11 in × 20 in (279 mm × 508 mm)
Low-pressure cylinder	18 in × 20 in (457 mm × 508 mm)

Performance figures
Tractive effort	13,175 lbf (58.61 kN)

Career
Operators	Wellington and Manawatu Railway, New Zealand Government Railways
Number in class	1
Numbers	WMR 13 NZR 457
Locale	Wellington - Longburn section
Disposition	Withdrawn

The O^A class is a solitary steam locomotive built by the Baldwin Locomotive Works for the Wellington and Manawatu Railway (WMR) in New Zealand. Ordered in 1894, it entered service in August of that year as No. 13 and was the first narrow gauge Vauclain compound in the world. In 1908, the WMR and its locomotive fleet were purchased by New Zealand Railways Department (NZR) and incorporated into the national rail network, and, although No. 13 bore a likeness to members of the O class, it was sufficiently different that it warranted separate classification. Accordingly, the designation of O^A was created and it was numbered O^A 457. It operated for another two decades until it was withdrawn in December 1929 in Auckland. The locomotive was known to Manawatu men as The Lady.

In 1896, a locomotive similar in appearance was ordered by the WMR, No. 16. Its technical specifications were such that when it was acquired by NZR it was classified separately and became the sole member of the O^C class.

References

W.W.Stewart, When Steam Was King, REED, 1970

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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