In the Whyte notation for the classification of steam locomotive wheel arrangement, a 2-4-4-0 is a locomotive with two leading truck, two sets of four driving wheels, and no trailing truck. Examples of this type were constructed as Mallet locomotives.
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Examples
The Chemins de Fer Departmentaux Vivarais and the Chemins de Fer Departmentaux Lozère each possessed 2-4-4-0 Mallet locomotives. The Société Alsacienne de Constructions Mécaniques built three for the Vivarais system in 1908 and two for the Lozère system in 1909.
Equivalent classifications
Other equivalent classifications are:
The UIC classification is 1B'B.
References
2-4-4-0 Wikipedia(Text) CC BY-SA