A1A-A1A Wheel Arrangement

The A1A-A1A wheel arrangement refers to a type of locomotive or heavy vehicle setup where each wheelset has three axles: the outer two axles are powered and have wheels that rotate together (A1A), while the middle axle is unpowered and can pivot independently. This configuration provides stability and weight distribution, especially on uneven tracks, reducing the stress on rails and improving ride quality. It's commonly used in heavy freight locomotives to balance power, safety, and track wear, ensuring efficient operation over long distances.