2-4-2

First known tank engine version
First known tank engine version
First use	1863
Country	United Kingdom
Locomotive	No. 21 White Raven
Railway	St Helens Railway
Designer	James Cross
Builder	Sutton Works

Equivalent classifications
Equivalent classifications
UIC class	1B1, 1'B1'
French class	121
Turkish class	24
Swiss class	2/4
Russian class	1-2-1

2-4-2 (Columbia)
	A Baldwin 2-4-2T locomotive, used on the private track in Raahe, Finland, later bought by Finnish State Railways
UIC class
Equivalent classifications
UIC class	1B1, 1'B1'
French class	121
Turkish class	24
Swiss class	2/4
Russian class	1-2-1
First use
First known tank engine version
First use	1863
Country	United Kingdom
Locomotive	No. 21 White Raven
Railway	St Helens Railway
Designer	James Cross
Builder	Sutton Works
First use
First known tender engine version
First use	1877
Country	New Zealand
Locomotive	K class
Railway	New Zealand Railways
Builder	Rogers Locomotive Works

Under the Whyte notation for the classification of steam locomotives, 2-4-2 represents the wheel arrangement of two leading wheels on one axle, four powered and coupled driving wheels on two axles and two trailing wheels on one axle. The type is sometimes named Columbia after a Baldwin 2-4-2 locomotive was showcased at the 1893 World's Columbian Exposition held at Chicago, Illinois.

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