NZR OB class

{{Use New Zealand English|date=July 2024}} {{Use dmy dates|date=July 2019}} {{DISPLAYTITLE:NZR O^B class}} {{Infobox locomotive |name = NZR O^B class |powertype = Steam |image =Ob Class steam locomotive, WMR 11, 2-8-0 type (later NZR 'Ob' class 455). ATLIB 309286.png |caption=Wellington and Manawatu Railway 11, circa 1904 |builder = [[Baldwin Locomotive Works]] |serialnumber = 9018, 9021 |builddate = 1888 |totalproduction = 2 |whytetype = [[2-8-0]] |uicclass = 1′C n |gauge={{Track gauge|3ft6in|lk=on}} |leadingdiameter = |driverdiameter = {{convert|43|in|m|3|abbr=on}} |wheelbase= |length = {{convert|51|ft|3|in|m|2|abbr=on}} |height = |width = |weightondrivers = {{long ton|34|6|lk=on}}<br>{{convert|34|LT|6|lcwt|t ST|lk=on}} |locoweight = {{long ton|38|10}}<br>{{convert|38|LT|10|lcwt|t ST}} |tenderweight = {{long ton|19|2}}<br>{{convert|19|LT|2|lcwt|t ST}} |fueltype = [[Coal]] |fuelcap = {{long ton|3|10}}<br>{{convert|3|LT|10|lcwt|t ST|sigfig=2}} |watercap = {{convert|1500|impgal|abbr=on}} |boilerpressure={{convert|165|lbf/in2|kPa|0|abbr=on}} |firearea = {{convert|16.5|sqft|m2|abbr=on}} |totalsurface = {{convert|1013|sqft|m2|abbr=on}} |cylindercount = Two, outside |cylindersize = {{convert|16|x|20|in|mm|0|abbr=on}} |valvegear = [[Stephenson valve gear|Stephenson]] |valvetype = [[Slide valve]]s |maxspeed= |poweroutput= |tractiveeffort= {{convert|15177|lbf|kN|2|abbr=on}} |operator=[[Wellington and Manawatu Railway]]<br />[[New Zealand Government Railways]] |fleetnumbers=WMR 11, 12<br />NZR 455, 456 |locale=[[Wellington and Manawatu Railway Company|Wellington - Longburn section]] |retiredate=1931, 1929 |firstrundate= |lastrundate= |scrapdate= |disposition=Withdrawn }}

The '''O^B class''' was the first class of [[steam locomotive]]s 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.{{sfn|Palmer|Stewart|1965|p=90}}

When the WMR and its locomotive fleet was acquired by the government and merged into the national [[New Zealand Railways Department|New Zealand Railways]] (NZR) in 1908, the two locomotives were considered to be similar to the [[NZR O class|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, New Zealand|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 [[NZR Nc class|N^C]] 461 and [[NZR UD class|U^D]] 465, both of which were withdrawn in the same month.

== Notes == {{reflist}}

==External links== * [http://www.trainweb.org/nzsteam/ob_class.html New Zealand Steam locomotives — O^B class]

== References == {{refbegin}} * {{NZR Steam Locomotive}} * {{Palmer & Stewart}} * {{When Steam Was King}} {{refend}}

{{NZR Locomotives}}

[[Category:Steam locomotives of New Zealand|Ob class]] [[Category:2-8-0 locomotives]] [[Category:1′D n2 locomotives]] [[Category:Baldwin locomotives]] [[Category:Scrapped locomotives]] [[Category:Railway locomotives introduced in 1888]] [[Category:3 ft 6 in gauge locomotives of New Zealand]]

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