that is the problem with VSKP Loco Shed....sometimes they attach WAM-4 sometimes WAG-5HA even WAG-7 also....VSKP should dedicate a WAP-4 either from VSKP/ED/LGD shed for this legendary train. previously when it used to run via Duvvada HWH WAP-4 hauled this train from Durgapur to Kanyakumari.