2-2-0
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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.
Bury 2-2-0 for the London and Birmingham Railway
Replica of the Planet at the Manchester Science Museum
Model (2002) of the steam locomotive constructed in Russia by the Cherepanovs (1834)
Planet (locomotive)
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Planet was an early steam locomotive built in 1830 by Robert Stephenson and Company for the Liverpool and Manchester Railway.
A contemporary engraving of a locomotive "similar to the Planet", though with some differences in detail