0-4-4-0

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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, Meyer and Double Fairlie 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.

Eritrean Railways used many 0-4-4-0Ts. The last was built in their own shops in 1963, making it the last Mallet built in the world. (See [1]).