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
* 2-2-4T
* 4-2-0
* 4-2-2
* 4-2-4T
* 6-2-0

* 0-3-0 (monorail)

* 0-4-0
* 0-4-0+4
* 0-4-2
* 0-4-4T
* 0-4-6T
* 2-4-0
* 2-4-2
* 2-4-4T
* 2-4-6T
* 4-4-0
* 4-4-2
* 4-4-4
* 4-4-6

* 0-6-0
* 0-6-2
* 0-6-4
* 0-6-6T
* 2-6-0
* 2-6-2
* 2-6-4
* 2-6-6T
* 4-6-0
* 4-6-2
* 4-6-4

* 0-8-0
* 0-8-2
* 0-8-4T
* 0-8-6
* 2-8-0
* 2-8-2
* 2-8-4
* 2-8-6
* 4-8-0
* 4-8-2
* 4-8-4
* 4-8-6
* 6-8-6

* 0-10-0
* 0-10-2
* 2-10-0
* 2-10-2
* 2-10-4
* 4-10-0
* 4-10-2

* 0-12-0
* 2-12-0
* 2-12-2
* 2-12-4
* 4-12-2

* 4-14-4

Divided drive and
Duplex engine types|

* 0-2-2-0
* 2-2-2-0
* 2-2-2-2
* 2-2-4-0T
* 4-2-2-0

* 2-4-6-2
* 4-4-4-4
* 6-4-4-6
* 4-4-6-4
* 4-6-4-4

Articulated locomotives
Fairlie, Meyer
and Garratt types|

* 0-4-0+0-4-0
* 2-4-0+0-4-2
* 2-4-2+2-4-2
* 4-4-2+2-4-4

* 0-6-0+0-6-0
* 0-6-2+2-6-0
* 2-6-0+0-6-2
* 2-6-2+2-6-2
* 4-6-0+0-6-4
* 4-6-2+2-6-4
* 4-6-4+4-6-4

* 2-8-0+0-8-2
* 2-8-2+2-8-2
* 4-8-0+0-8-4
* 4-8-2+2-8-4
* 4-8-4+4-8-4

Articulated locomotives
Mallet types|

* 0-4-4-0
* 0-4-4-2
* 2-4-4-0
* 2-4-4-2

* 0-6-6-0
* 2-6-6-0
* 2-6-6-2
* 2-6-6-4
* 2-6-6-6
* 2-6-8-0
* 4-4-6-2
* 4-6-6-2
* 4-6-6-4

* 0-8-6-0
* 0-8-8-0
* 2-8-8-0
* 2-8-8-2
* 2-8-8-4
* 4-8-8-2
* 4-8-8-4

* 2-10-10-2

Articulated locomotives
Triplex and other Multiplex types|

* 2-8-8-8-2
* 2-8-8-8-4

* 2-8-8-8-8-2
* 0-6-2+2-4-2-4-2+2-6-0
* 2-6-6-2+2-6-6-2

* 2-8-8-8-8-8-2
* 2-10-10-10-10-10-2

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

Articulated locomotives
Engerth types|

* 0-4-4
* 0-4-6

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

* 0-8-4
* 0-8-6

Geared locomotives|

* Shay
* Climax
* Heisler
* Willamette

* Other notation forms: AAR
* Swiss
* UIC

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