Front of locomotive to the left

The single S2, Template:Abbr 6200, in a PRR promotional image.
Under the Whyte notation for the classification of steam locomotives by wheel arrangement, 6-8-6 represents the arrangement of six unpowered leading wheels arranged into a three-axle leading truck, eight powered driving wheels, and six unpowered trailing wheels arranged into a three-axle trailing truck.
Other equivalent classifications are:
- UIC classification: 3D3 (also known as German classification and Italian classification)
- French classification: 343
- Turkish classification: 410
- Swiss classification: 4/10.
The only known example of the 6-8-6 wheel arrangement is the experimental Pennsylvania Railroad S2 steam turbine locomotive.
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