Locomotive wheel arrangement
2-4-2 (Columbia)![Diagram of a single small leading wheel, two large coupled wheels and a single small trailing wheel](//upload.wikimedia.org/wikipedia/commons/thumb/a/ae/WheelArrangement_2-4-2.svg/300px-WheelArrangement_2-4-2.svg.png) |
![](//upload.wikimedia.org/wikipedia/en/thumb/c/cd/Baldwin242.jpg/300px-Baldwin242.jpg) |
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First known tank engine version |
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First use | 1863 |
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Country | United Kingdom |
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Locomotive | No. 21 White Raven |
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Railway | St Helens Railway |
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Designer | James Cross |
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Builder | Sutton Works |
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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.