Under the Whyte notation for the classification of steam locomotives, a 2-8-8-8-4 has two leading wheels, three sets of eight driving wheels, and four trailing wheels.. Other equivalent classifications are: UIC classification: 1DDD2 (also known as German classification and Italian classification) French classification: 140+040+042 Turkish classification: 45+44+46

Under the Whyte notation for the classification of steam locomotives, 0-4-4 represents the wheel arrangement of no leading wheels, four powered and coupled driving wheels on two axles, and four trailing wheels on two axles. This type was only used for tank locomotives.. In American cities, the type known as a Forney locomotive, was used on the narrow curves of elevated …