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2-4-2
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{{Short description|Locomotive wheel arrangement}} {{Infobox steam wheel arrangement | name = 2-4-2 (Columbia) | image = WheelArrangement 2-4-2.svg | alt = Diagram of a single small leading wheel, two large coupled wheels and a single small trailing wheel | caption = | image2 = Baldwin242.jpg | alt2 = | caption2 = A Baldwin 2-4-2T locomotive, used on a private railway in [[Raahe]], [[Finland]]. It was later bought by [[VR Group|Finnish State Railways]]. <!--Equivalent classifications--> | hatnote = | UIC/Germany/Italy= 1B1, 1'B1' | French/Spanish = 121 | Turkish = 24 | Swiss = 2/4 | Russian = 1-2-1 <!--First tank engine version--> | date = 1863 | country = United Kingdom | locomotive = No. 21 ''White Raven'' | railway = [[St Helens Railway]] | designer = James Cross | builder = Sutton Works | evolvedfrom = | evolvedto = | mainbenefit = | maindrawback = <!--First tender engine version--> | date2 = 1877 | country2 = New Zealand | locomotive2 = [[NZR K class (1877)|K class]] | railway2 = [[New Zealand Railways Department|New Zealand Railways]] | designer2 = | builder2 = [[Rogers Locomotive and Machine Works|Rogers Locomotive Works]] | evolvedfrom2 = | evolvedto2 = | mainbenefit2 = | maindrawback2 = <!--First "True type" version--> | date3 = | country3 = | locomotive3 = | railway3 = | designer3 = | builder3 = | evolvedfrom3 = | evolvedto3 = | mainbenefit3 = | maindrawback3 = }} Under the [[Whyte notation]] for the classification of [[steam locomotive]]s, '''{{nowrap|2-4-2}}''' represents the [[wheel arrangement]] of two [[leading wheel]]s on one axle, four powered and coupled [[driving wheel]]s on two axles and two [[trailing wheel]]s on one axle. The type is sometimes named '''Columbia''' after a [[Baldwin Locomotive Works|Baldwin]] {{nowrap|2-4-2}} locomotive was showcased at the 1893 [[World's Columbian Exposition]] held at Chicago, Illinois. {{TOC limit|3}}
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