Sir ji don't underestimate the power of WAP4. It is among the most reliable loco if IR. Its TE is also more than WAP5. Agree WAP5 is a new generation eloco but it still cannot compare itself with WAP4 when it comes to performance, gradient hauling, etc. WAP5 was basically design for high speed with 16 to 18 coach on mind and can haul 24 coach load too but WAP4 too can haul 24 coach load upto 130kmph at ease. Yes WAP5 has faster acceleration and regenerative braking but still due to BO BO bogies wheel slip problem is quite common. And WAP4 has a history of less failure proved successful in ghats after WAM4.