Ammi Jaan kahti thi Railfanning se bada koi dharm nhi hota or koi Railfan chhota nhi hota - Shanzil Kabir

Regarding loco change.
Only trains terminating at CAN and CLT will be having eLoco.
As per the info i got from my friend whose dad is LP in PGT div. First phase 6 pairs of train will be getting eLoco.
Trains are
12081/82,...
more...

12075/76 Both JS
Alapuzha CAN Executive Express
Ernakulam Kannur Intercity Express
YPR-CAN Express via Salem(ED-CAN)
One Passenger.
Not sure how much it is true. Except YPR-CAN, all trains had high chance of getting eloco. Since sufficient parking space and platform is not there, other trains will have loco change at SRR itself.
Have to wait and see, if any more trains make up into the list