0-4-4-0

In the Whyte notation for the classification of steam locomotive wheel arrangement, an 0-4-4-0 is a locomotive with zero leading wheels, two sets of four driving wheels, and zero trailing wheels. Examples of this type were constructed as Mallet, Meyer, BMAG and Double Fairlie locomotives. A similar configuration was used on some Garratt locomotives, but it is referred to as 0-4-0+0-4-0.