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File:WheelArrangement 6-8-6.svg

Front of locomotive to the left

PRR S2

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.

Cornish Riviera Limited, 6002 King George IV (CJ Allen, Steel Highway, 1928)

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