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A 4-4-6-4, in the Whyte notation
Whyte notation
for the classification of steam locomotives by wheel arrangement , is one that has four leading wheels followed by four coupled driving wheels , a second set of six coupled driving wheels and four trailing wheels .

The Pennsylvania Railroad
Pennsylvania Railroad
's Q2 class were the only locomotives ever to use this arrangement. These were duplex locomotives , in which both sets of driving wheels were mounted in a common, rigid locomotive frame . This locomotive design was a further development of the highly successful 2-10-4
2-10-4
. The divided drive , or duplex arrangement, allowed for higher speeds with less damage to the track.

Other equivalent classifications are: UIC classification : 2BC2 (also known as German classification and Italian classification ) French classification
French classification
: 2232 Turkish classification : 2435 Swiss classification
Swiss classification
: 2/4+3/5 up to the early 1920s, later 5/9

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Steam locomotive
Steam locomotive
wheel arrangements

SINGLE ENGINE TYPES

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

* 0-3-0
0-3-0

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

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

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

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

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

* 4-14-4
4-14-4

Divided drive and Duplex engine types

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

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

* 4-6-4-4

Articulated locomotives Fairlie , Meyer and Garratt
Garratt
types

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

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

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

Articulated locomotives Mallet types (includes Triplex types )

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

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

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

* 2-1 0-10-2

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

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

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

* 2-10-10-10-1 0-10-2

Articulated locomotives Engerth types

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

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

This steam locomotive-related article is a stub . You can help by expanding it .

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