I have seen OHE Poles and Catenary Wires at BSB & BE way back in 2012 without any electric loco since the route was not energized. My next train journey on this route will be the 1st time when I will see Wappies and Wammies between MGS and MB. I still remember the unelectrified stretch between Lucknow and Ambala Cantt in April, 2004 and the first OHE Poles in Nov, 2004 being erected. But diesels are not out of Varanasi and Mughalsarai since they will keep pouring in from Rae-Bareli and Chapra Sides with some passenger and freight trains :)