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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.

Notes※

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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