page_title: 6-8-6
hierarchical_section_title: 6-8-6
context_page_description: 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
  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.
context_section_description: 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.
caption: Front of locomotive to the left