NZR OB class

NZR O^B class

Type and origin
Power type	Steam
Builder	Baldwin Locomotive Works
Serial number	9018, 9021
Build date	1888
Total produced	2

Specifications
Configuration	2-8-0
UIC class	1′C n
Gauge	3 ft 6 in (1,067 mm)
Driver dia.	43 in (1.092 m)
Length	51 ft 3 in (15.62 m)
Adhesive weight	34 long tons 6 cwt (76,800 lb or 34.9 t) 34 long tons (34.545595 t)
Loco weight	38 long tons 10 cwt (86,200 lb or 39.1 t) 38 long tons (38.6097825344 t)
Tender weight	19 long tons 2 cwt (42,800 lb or 19.4 t) 19 long tons (19.30 t)
Fuel type	Coal
Fuel capacity	3 long tons 10 cwt (7,800 lb or 3.6 t) 3 long tons (3.0481407264 t)
Water cap	1,500 imp gal (6,800 l; 1,800 US gal)
Firebox: • Firegrate area	16.5 sq ft (1.53 m²)
Boiler pressure	165 lbf/in² (1,138 kPa)
Heating surface	1,013 sq ft (94.1 m²)
Cylinders	Two, outside
Cylinder size	16 in × 20 in (406 mm × 508 mm)
Valve gear	Stephenson
Valve type	Slide valves

Performance figures
Tractive effort	15,177 lbf (67.51 kN)

Career
Operators	Wellington and Manawatu Railway New Zealand Government Railways
Numbers	WMR 11, 12 NZR 455, 456
Locale	Wellington - Longburn section
Retired	1931, 1929
Disposition	Withdrawn

The O^B class was the first class of steam locomotives constructed by the Baldwin Locomotive Works for the Wellington and Manawatu Railway Company (WMR) in New Zealand. The class consisted of two locomotives ordered in 1888, and they entered service in September of that year as WMR No.'s 11 and 12. When the WMR and its locomotive fleet was acquired by the government and merged into the national New Zealand Railways (NZR) in 1908, the two locomotives were considered to be similar to the O class but with enough differences to warrant the separate O^B classification. No. 11 became O^B 455 and No. 12 became O^B 456, and they ended their days working around Napier. O^B 456 was retired in September 1929, and was followed in March 1931 by O^B 455, which had survived to be one of the final operating locomotives of WMR heritage, along with N^C 461 and U^D 465, both of which were withdrawn in the same month.

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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