0-2-2

Stephenson's Rocket, an early 0-2-2 locomotive.

An 0-2-2, in the Whyte notation for the classification of steam locomotives by wheel arrangement, is one that has two coupled driving wheels followed by two trailing wheels, with no leading wheels .

The equivalent UIC classification is A1.

The 0-2-2 arrangement was used in the early days of the steam locomotive, and little thereafter. A famous 0-2-2 is Stephenson's Rocket. Its fellow competitor in the Rainhill Trials, John Ericsson and John Braithwaite's Novelty, was also an 0-2-2. Eight subsequent Stephenson locomotives for the Liverpool and Manchester Railway were of the 0-2-2 type; these were Meteor, Comet, Dart, Arrow, Phoenix, North Star, Northumbrian, and Majestic, following which Stephenson locomotives switched to the 2-2-0 Planet type. The pioneering American locomotive Tom Thumb was also of 0-2-2 configuration.

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

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