There are trains which run on HOG even if they are hauled by diesel loco for a part of their journey enroute. The GKP Humsafar via Barhni gets a HOG WAP7 and runs on HOG between GD and ANVT. The WAP7 is attached at GKP itself and is towe by diesel loco from GKP to GD. Turning on/off an EOG shouldnt be a cumbersome process I guess. This pic is of 12295 coming to MAS for reversal. Sometimes 12295 gets WAP4 till MAS or a non HOG WAP7. So HOG is not a regular one between MAS and SBC.