Fairlie locomotive

A Fairlie locomotive is a type of articulated steam locomotive that has the driving wheels on bogies. It was invented by Robert Francis Fairlie. The locomotive may be double-ended (a double Fairlie) or single ended (a single Fairlie). Most double-ended Fairlies had wheel arrangements of 0-4-4-0T or 0-6-6-0T. All were tank locomotives.

While Fairlie locomotives are now used only on heritage railways, the majority of diesel and electric locomotives in the world follow the basic form of the Fairlie — two power trucks with all axles driven. Many also follow the Fairlie's double-ended concept, capable of being driven equally well in both directions.

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