![]() "1A-A1" means there are two trucks (or wheel assemblies) under the unit. A plus sign ("+") refers to articulation, either by connecting bogies with span bolsters or by connecting individual locomotives via solid drawbars instead of couplers. A dash ("–") separates trucks or wheel assemblies. ![]() "1" refers to one idler axle, and "2" to two idler axles in a row. "A" refers to one powered axle, "B" to two powered axles in a row, "C" to three powered axles in a row, and "D" to four powered axles in a row. ![]() Letters refer to powered axles, and numbers to unpowered (or idler) axles. ![]() The AAR system counts axles instead of wheels. It is not used for steam locomotives, which use the Whyte notation instead. 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). The AAR wheel arrangement system is a method of classifying locomotive (or unit) wheel arrangements that was developed by the Association of American Railroads. ( Learn how and when to remove this template message) ( February 2014) ( Learn how and when to remove this template message) You can help to improve it by introducing citations that are more precise. This article cites its sources but does not provide page references.
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