It's a decision of WR/ECOR to give it a E-Loco or not plus it's still a newly electrified section so it will take time to switch all the links plus E-Loco's are limited as every other line is getting electrified and eloco shortage happens so BRC would also not allow it to go beyond Raipur as WR got many trains that change E-Loco at Raipur so they can get attach to different trains and use them for backup...