0-4-4-0

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An 0-4-4-0 of the metre gauge C. de F. de Madagascar.
An 0-4-4-0 of the metre gauge C. de F. de Madagascar.

In the Whyte notation for the classification of steam locomotive wheel arrangement, a 0-4-4-0 is a locomotive with no leading truck, two sets of four driving wheels, and no trailing truck. Examples of this type were constructed as Mallet and Meyer locomotives. A similar configuration was used on some Garratts, but it is referred to as 0-4-0+0-4-0.

Other equivalent classifications are:
UIC classification: BB (also known as German classification and Italian classification)
French classification: 020+020
Turkish classification: 22+22
Swiss classification: 2/2+2/2

The UIC classification is refined to B'B for a Mallet locomotive or B'B' for a Meyer locomotive.


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Steam locomotive types
Single engine types
0-2-2 • 2-2-0 • 2-2-2 • 2-2-4 • 4-2-0 • 4-2-2 • 4-2-4 • 6-2-0
0-3-0
0-4-0 • 0-4-2 • 0-4-4 • 2-4-0 • 2-4-2 • 2-4-4 • 4-4-0 • 4-4-2 • 4-4-4 • 4-4-6
0-6-0 • 0-6-2 • 0-6-4 • 2-6-0 • 2-6-2 • 2-6-4 • 2-6-6 • 4-6-0 • 4-6-2 • 4-6-4
0-8-0 • 0-8-2 • 0-8-4 • 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
Duplex engine types
Garratt (articulated) types
Mallet (articulated) types
(includes Triplex)
0-4-4-0 • 0-4-4-2 • 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 • 4-6-6-2 • 4-6-6-4
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 • 2-8-8-8-2 • 2-8-8-8-4
Engerth (articulated) types
0-4-4 • 0-4-6
2-6-2 • 0-6-4 • 0-6-4-0
0-8-4 • 0-8-6