Why do you people keep on dragging Saptkranti for every reason, if it would have been running via CNB-ALD-DDU then your comparison would have some weight, but it's cent percent worthless disposition to drag a train of totally different route in the scene.
.
And let me get this into that thick skull of yours, Saptkranti is best train, and the fastest of all between ANVT-GKP via MB-LKO route, compare for yourself.