4-4-6

4-4-6 locomotive

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).

The only example of this wheel arrangement was the Thuile locomotive.

Other equivalent classifications are:

UIC classification: 2'B3' (also known as German classification
Italian classification), and
French classification: 223.

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Steam locomotive wheel arrangements (Whyte notation)

Single engine types

0-2-2
0-2-4
2-2-0
2-2-2
2-2-4
4-2-0
4-2-2
4-2-4
6-2-0

0-3-0 (monorail)

4-14-4

Divided drive and
Duplex engine types

Articulated locomotives
Fairlie, Meyer
and Garratt types

Articulated locomotives
Mallet types

2-10-10-2

Articulated locomotives
Triplex and other Multiplex types

2-4-4-2+2-8-8-2+2-4-4-2

Articulated locomotives
Engerth types

0-4-4
0-4-6

0-8-4
0-8-6

Geared locomotives

Other notation forms: AAR
Swiss
UIC

References

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