0-4-6

An 0-4-6, in the Whyte notation for the classification of steam locomotives by wheel arrangement, is a locomotive with no leading wheels, four driving wheels fixed in a rigid frame, and six trailing wheels (normally mounted in a trailing truck). Examples of this type of locomotive were built by Wilhelm von Engerth.

Other equivalent classifications are:

UIC classification: B3 (also known as German classification and Italian classification)

French classification: 023