6-8-6

Locomotive wheel arrangement
Front of locomotive to the left
The single S2, No. 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, eight powered and coupled driving wheels, and six unpowered trailing wheels.

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.[1]

Notes

  1. ^ Staufer & Pennypacker 1962, pp. 240–242

References

  • Staufer, Alvin F.; Pennypacker, Bert (1962). Pennsy Power: Steam and Electric Locomotives of the Pennsylvania Railroad, 1900-1957. Research by Martin Flattley. Carollton, Ohio: Alvin F. Staufer. ISBN 978-0-9445-1304-0.
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Steam locomotive wheel arrangements (Whyte notation)
Single engine typesDivided drive and
Duplex engine typesArticulated locomotives
Fairlie, Meyer
and Garratt typesArticulated locomotives
Mallet typesArticulated locomotives
Triplex and other Multiplex typesArticulated locomotives
Engerth typesGeared locomotives
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