Sir as per my knowledge electrification is in progress till NJP so u can change eloco at njp would be better and it save ur time bcoz njp is halt for 20 minutes for mostly all trains, agar aap vaha loco change krenge to ek teer se do nishana lagega, secondly isse aap vapas express ki category me hi daal dijiye bcoz 51 ki avg speed me sf charges dena koi pasand nhi krega, thanks, make this changes otherwise a red flag from my side,