6-2-0

In the Whyte notation, a 6-2-0 is a railroad steam locomotive that has an unpowered three-axle leading truck followed by a single powered driving axle. This wheel arrangement is associated with the Crampton locomotive type, and in the USA the single class were sometimes referred to as Cramptons.

Other equivalent classifications are:
UIC classification: 3A (also known as German classification and Italian classification)
French classification: 310
Turkish classification: 14
Swiss classification: 1/4