Yes, UBL WDG4D in between WDP4s.
That night Hampi had stopped for almost 1.5hrs somewhere while there was one overtake (probably YPR-GKP exp as it runs on Thursday) and many crossings, either its loco must have failed there or this must be a regular affair as its single line with too many crossings and got the extra locos at GTL. Still reached UBL 20mins late.