Under the Whyte notation for the classification of steam locomotives, 0-10-2 represents the wheel arrangement of no leading wheels, ten powered and coupled driving wheels on five axles, and two trailing wheels on one axle (usually in a trailing truck).
Other equivalent classifications are:
UIC classification: E1 (also known as German classification and Italian classification)
French classification: 051
Turkish classification: 56
Swiss classification: 5/6