Fog,congestion are all understandable reasons but how does ALD explain 1 hr 35 min for reversal. I think NCR should follow similar scheme for reversal as VSKP / MGS. Incoming loco is detached from one end and another loco is attached at another end, instead of waiting for same loco to reverse and go around. If different locos are used for two ends, reversal time can be significantly reduced.