According to the speed certificate published by RDSO, a WAP5 can haul 18-21 coaches on the ghats in the NGP div (CR) without bankers (like WAP4, WDM3A, WDM3D, WDG3A, WAG7, WAG5...).
Also, except WAP7, no other loco can be allowed to climb those ghats without bankers with 24-25 coaches.