See Gkp to Lko is double track fully only between ghagra ghat to choka ghat where another ghaghra bridge is building its almost finished, after operation GKP-LKO route will be fully double. i did a survey last week on it. BBK-GD section is electrified completly but not operational. GD-GKP is under electrification work. Now coming to main question, trains taking time because of low MPS only crossing time of Lko by any train is almost 45 min. Including halting, outer, and leaving.
This is why it is happaning. Thanks :)