lots have been said about use of p5/7 for this train.lets come to the fact-wap5 locos are found only in GZB shed,so getting them is not possible.about wap7,HWH has only 1 p7 running with dhanbad DD express.it can get AJNI wap7,but i think HWH p4s are better than AJNI p7s.
the only way to reduce 1 hr journey for this train is when suburbs of CR,alike WR gets full AC traction.it will save time wasted during loco change at IGP.also with waps,IGP-CSTM stretch will be covered faster than WCAMs.