Surprise surprise... well on 6th July, I saw this train being led by a WAP4. I was stuck at a Railway crossing between Sargachi and Beldanga. My bus was standing way back. so couldn't see the
#number. Bt was very amazed to see P4 going all guns blazing on that route.
NB: it may or may not be P4, experts cud say more, may be WAM4 in WAP4 shell. This may also happen.