AAR wheel arrangement

The AAR wheel arrangement system is a method of classifying locomotive (or unit) wheel arrangements that was developed by the Association of American Railroads. Essentially a simplification of the European UIC classification, it is widely used in North America to describe diesel and electric locomotives (including third-rail electric locomotives). It is not used for steam locomotives anywhere, which use the Whyte notation instead, except geared steam locomotives, which are instead classified by their model and their number of trucks (bogies in Commonwealth English). The AAR system (like UIC) counts axles, unlike Whyte notation, which counts wheels.

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