AAR axle classification

The AAR (Association of American Railroads) classification is a system for explaining the wheel arrangements of locomotives and multiple units. The system is a simplification of the European version.
==Syntax==
These are the rules of the code:
*Capital letters denote powered axles: A = 1 powered axle; B = 2; C = 3 etc.
*A number denotes a non-powered axle.
*A dash ( - ) denotes the end of a truck, and/or the beginning of another.
*A plus sign ( + ) denotes articulation.
==References==
*Book: The Railway Data File published by Silverdale Books. .
*Wikipedia.org
*Pacific Southwest Railway Museum.org
Category:Encyclopedic articles