0-12-0

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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.