4 4 6

Updated on Dec 27, 2023

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A 4-4-6, in the Whyte notation for the classification of steam locomotives by wheel arrangement, is a locomotive with:

four (4) leading wheels (at the front of the locomotive)

four (4) driving wheels (2 axles) fixed in a rigid frame, and

six (6) trailing wheels (normally mounted in a trailing truck).

An example of this wheel arrangement was the Thuile locomotive.

Other equivalent classifications are:

UIC classification: 2B3 (also known as German classification

Italian classification), and

French classification: 223.

References

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