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 (generally in a leading truck), four driving wheels (two driving axles) and two trailing wheels, normally in a trailing truck. The type is sometimes named "Columbia" after an early locomotive of 2-4-2 arrangement.
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. The symmetrical arrangement suits a tank locomotive, which may travel in either direction.
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| Steam locomotive types |
|---|
| Single engine types |
| 0-2-2 | 2-2-0 | 2-2-2 | 2-2-4 | 4-2-0 | 4-2-2 | 4-2-4 | 6-2-0 |
| 0-4-0 | 0-4-2 | 0-4-4 | 2-4-0 | 2-4-2 | 2-4-4 | 4-4-0 | 4-4-2 | 4-4-4 |
| 0-6-0 | 0-6-2 | 0-6-4 | 2-6-0 | 2-6-2 | 2-6-4 | 2-6-6 | 4-6-0 | 4-6-2 | 4-6-4 |
| 0-8-0 | 0-8-2 | 0-8-4 | 2-8-0 | 2-8-2 | 2-8-4 | 2-8-6 | 4-8-0 | 4-8-2 | 4-8-4 | 4-8-6 | 6-8-6 |
| 0-10-0 | 0-10-2 | 2-10-0 | 2-10-2 | 2-10-4 | 4-10-0 | 4-10-2 |
| 0-12-0 | 2-12-0 | 2-12-2 | 2-12-4 | 4-12-2 | 4-14-4 |
| Duplex engine types |
| 4-4-4-4 | 6-4-4-6 | 4-4-6-4 | 4-6-4-4 |
| Garratt (articulated) types |
| 0-4-0+0-4-0 | 2-6-0+0-6-2 | 4-6-2+2-6-4 | 2-8-0+0-8-2 | 4-8-4+4-8-4 |
| Mallet (articulated) types |
| 0-4-4-0 | 0-4-4-2 | 2-4-4-2 |
| 0-6-6-0 | 2-6-6-0 | 2-6-6-2 | 2-6-6-4 | 2-6-6-6 | 2-6-8-0 | 4-6-6-2 | 4-6-6-4 |
| 0-8-8-0 | 2-8-8-0 | 2-8-8-2 | 2-8-8-4 | 4-8-8-2 | 4-8-8-4 |
| 2-10-10-2 | 2-8-8-8-2 | 2-8-8-8-4 |
