2-2-0

First known "True type" version
First known "True type" version
Drawbacks	Worse adhesion without coupled wheels

Equivalent classifications
Equivalent classifications
UIC class	1B
French class	120
Turkish class	23
Swiss class	1/2
Russian class	1-2-0

2-2-0 (Planet)
	Bury 2-2-0 for the London and Birmingham Railway
UIC class
Equivalent classifications
UIC class	1B
French class	120
Turkish class	23
Swiss class	1/2
Russian class	1-2-0
Drawbacks
First known "True type" version
Drawbacks	Worse adhesion without coupled wheels

Under the Whyte notation for the classification of steam locomotives, 2-2-0 represents the wheel arrangement of two leading wheels on one axle, two powered driving wheels on one axle, and no trailing wheels. This configuration, which became very popular during the 1830s, was commonly called the Planet type after the first locomotive, Robert Stephenson's Planet of 1830.

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