2-4-2
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In the Whyte notation for the classification of steam locomotives by wheel arrangement, a 2-4-2 has two leading wheels, four driving wheels (two driving axles) and two trailing wheels. The type is sometimes named "Columbia" after an early locomotive of 2-4-2 arrangement.
Other equivalent classifications are:
UIC classification: 1B1 (also known as German classification and Italian classification)
French classification: 121
Turkish classification: 24
Swiss classification: 2/4
The equivalent UIC classification is 1'B1', if the leading and trailing wheels are in swivelling trucks.
While a number of 2-4-2 tender locomotives were built, larger types soon became dominant. The vast majority of 2-4-2s have been tank locomotives, designated 2-4-2T. The symmetrical arrangement suits a tank locomotive, which may travel in either direction.
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