2-2-0

2-2-0 (Planet)

Bury 2-2-0 for the London and Birmingham Railway

Equivalent classifications UIC class 1A French class 110 Turkish class 12 Swiss class 1/2 Russian class 1-1-0

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.