I think electric engines will only haul trains if complete electrification is done eaither up to sbp or R b'cause if trains r changing thir locos at tig then they will halt here for more then 20 min as well as their are no sheds to keep and maintain elocos and vskp is like a terminus its better for trainsand its timings to change their locos at vskp
And major thing is about staff(loco pilot)change and their is a working time of 6 to 8 hrs a day thats why sambalpur is electrified but still all train locos are changed at rourkela(except asansol mad exp)or unchanged(yeswantpur hatia and tata expresses)