What is the Rated Powered Axles (RPA) of an SD40 locomotive?

The Rated Powered Axles (RPA) of an SD40 locomotive is 6. This indicates that the locomotive is equipped with six axles that are powered, which contributes to its ability to effectively transfer power to the tracks. This design allows for better traction and performance, especially when hauling heavy loads over various terrains. In the context of locomotive operation, having a greater number of powered axles can enhance the locomotive's efficiency and stability during train movements. The SD40 is engineered to optimize performance, with the six powered axles providing sufficient power and grip to meet operational demands in freight service. This distinguishes it from other locomotives that may have fewer powered axles, reflecting a balance between power output and design considerations in its construction.