
thumb|Replica of Adler at Fürth, May 2008 Under the Whyte notation for the classification of steam locomotives, 2-2-2 represents the wheel arrangement of two leading wheels on one axle, two powered driving wheels on one axle, and two trailing wheels on one axle. The wheel arrangement both provided more stability and enabled a larger firebox than the earlier 0-2-2 and 2-2-0 types. This wheel arrangement is sometimes described as a Single, although this name could be used to describe any kind of locomotive with a single pair of driving wheels.
thumb|Replica of Adler at Fürth, May 2008 Under the Whyte notation for the classification of steam locomotives, 2-2-2 represents the wheel arrangement of two leading wheels on one axle, two powered driving wheels on one axle, and two trailing wheels on one axle. The wheel arrangement both provided more stability and enabled a larger firebox than the earlier 0-2-2 and 2-2-0 types. This wheel arrangement is sometimes described as a Single, although this name could be used to describe any kind of locomotive with a single pair of driving wheels.
==Equivalent classifications== Other equivalent classifications are: UIC classification: 1A1 (also known as German classification and Italian classification) French classification: 111 Turkish classification: 13 Swiss classification: 1/3
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).