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| ID # 887 |
Whyte's Classification System for distinguishing locomotive types by their wheel arrangements was devised in 1900 by Frederic M. Whyte, a New York Central official. Whyte divided engine wheels into three groups: pony - or leading-truck wheels, driving wheels (usually the largest), and trailing-truck wheels. The last-named were placed under the cab.. A Mogul, for example, has two pony-truck wheels, six drivers, and no other wheels hence it is a 2-6-0. Whytes system, though ingenious, does not indicate the presence or absence of a booster. the small reciprocating steam engine sometimes fastened to trailing-truck wheels to supply extra starting power. These diagrams show the best-known steam locomotive wheel arrangements. A complete all-time list would include about seventy different types.
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