NZR OB class

NZR OB class

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NZR OB class


Name	NZR O^B class
Powertype	Steam
Builder	Baldwin Locomotive Works
Serialnumber	9018, 9021
Builddate	1888
Totalproduction	2
Whytetype	2-8-0
Uicclass	1′C n
Gauge	42
Driverdiameter	43 in (1.1 m)
Length	51 ft 3 in (1.3 2)
Weightondrivers
Weight
Tenderweight
Fueltype	Coal
Fuelcap
Watercap	1500 impgal (38.1 2)
Boilerpressure	165 lbf/in2 (4.2 MPa)
Firearea	16.5 sqft (1.5 m2)
Totalsurface	1013 sqft (94.1 m2)
Cylindercount	Two, outside
Cylindersize	16 x 20 in (406.4 x 508 mm )
Valvegear	Stephenson
Valvetype	Slide valves
Tractiveeffort	15177 lbf (385495.8 kN)
Railroad	Wellington and Manawatu Railway New Zealand Government Railways
Roadnumber	WMR 11, 12 NZR 455, 456
Locale	Wellington - Longburn section
Retiredate	1931, 1929
Disposition	Withdrawn

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The O^B class was the first class of steam locomotives constructed by the Baldwin Locomotive Works for the Wellington and Manawatu Railway (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 sufficiently different 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to be one of the final operating locomotives of WMR heritage, along with N^C 461 and U^D 465, both of which were withdrawn in the same month.

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Rail vehicles of New Zealand

Battery electric locomotives		E - EB
Diesel locomotives		DA (inc. DAA, DAR) - DB (inc. DBR) - DC (inc. DCP) - DE - DF (English Electric) - DF (General Motors) inc. DFT - DG (inc. DH of 1956) - DH of 1978 - DI - DJ - DL - DQ (inc. QR) - DS - DSA - DSB - DSC - DSG - DSJ - DX (inc. DXB, DXC and DXR) - TR
Diesel Multiple Units		ADK (inc. ADB trailers) - ADL (inc. ADC trailers)
Electric locomotives		EA (later EO of 1968) - EC - ED - EF - EO of 1923 - EW
Electric Multiple Units		DM (inc. D trailers) - EM (inc. ET trailers) - "Matangi" FP (inc. FT trailers)
Railcars		RM class railcars: 88 seater (also known as Fiats or twinsets) - Clayton steam railcar - Edison battery-electric railcar - Leyland diesel railbus - Leyland experimental petrol railcar - MacEwan-Pratt petrol railcar - Model T Ford railcar - Sentinel-Cammell steam railcar - Silver Fern - Standard - Thomas Transmission - Vulcan - Wairarapa - Westinghouse Non-RM class railcar: A 88 Buckhurst petrol carriage
Steam locomotives		A of 1873 - A of 1906 (inc. Ad) - 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 1872-75 - 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 (inc. W^S) - W^B - W^D - W^E - W^F - W^G - W^H - W^J - W^W - X - Y
Locomotive hauled carriages		50-foot carriage - 56-foot carriage - ex-British Rail Mark 2 carriage- AK carriage - FM class guards van
See also: Locomotives of New Zealand; Motive power explanation; Multiple units and Railcars descriptions.

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