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A 2-2-0, in the Whyte notation for the classification of steam locomotives by wheel arrangement, has one unpowered leading axle and one powered driving axle. This type, which was one of the earliest ever produced, was commonly called the Planet type after the first locomotive built in 1830 to this configuration, Robert Stephenson's Planet.

The equivalent UIC classification is 1A.

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