The A1A-A1A wheel arrangement is a type of locomotive configuration used primarily in diesel-electric engines. It features three axles, with the outer two axles powered and the center axle unpowered. This design allows for better weight distribution and improved traction, making it suitable for various rail conditions. This arrangement is commonly found in American freight and passenger locomotives, providing a balance between power and stability. The A1A-A1A setup is particularly advantageous for operations on curves, as the unpowered center axle helps reduce wear on the tracks and enhances maneuverability.