AAR wheel arrangement

AAR wheel arrangement is a system for classifying locomotives used in North America. It is a simplified form of the UIC classification of locomotive axle arrangements.

Examples
 A1A-A1A Two bogies or wheel assemblies under the unit. Each bogie has two powered axles and one unpowered axle
 B-B Two bogies or wheel assemblies under the unit. Each bogie has two powered axles 
 C-C Two bogies or wheel assemblies under the unit. Each bogie has three powered axles 

Category:Locomotive classification systems