Under the Whyte notation for the classification of steam locomotives by wheel arrangement, 6-8-6 represents the arrangement of six (6) unpowered leading wheels arranged into a three-axle leading truck, eight (8) powered driving wheels, and six (6) unpowered trailing wheels arranged into a three-axle trailing truck.
Other equivalent classifications are:
- Staufer & Pennypacker 1962, pp. 240–242
- Staufer, Alvin F.; Pennypacker, Bert (1962). Pennsy Power: Steam and Electric Locomotives of the Pennsylvania Railroad, 1900-1957. Research by Martin Flattley. Carollton, OH: Alvin F. Staufer. ISBN 978-0944513040. LCCN 62020878. OCLC 602543182.
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