0-12-0

In Whyte notation, a 0-12-0 is a railroad steam locomotive that has twelve coupled driving wheels, with no leading wheels or trailing wheels.

Other equivalent classifications are:

UIC classification: F (also known as German classification and Italian classification)

French classification: 060

Turkish classification: 66

Swiss classification: 6/6

The first 0-12-0 was the "Pennsylvania" built for the Philadelphia and Reading Railroad in 1863.