Nagpur to Amritsar AC train will run empty. Just check how good Chhattisgarh Exp (only train between NGP and ASR) AC occupancy is there. You will get waiting of 1 or 2 in AC 1 Tier, waiting of less than 10 in AC 2 Tier, waiting of less than 20 in AC 3 Tier for coming 2-3 days. And this train is originated from Bilaspur, covering several big cities (Raipur, Bilaspur, Bhilai) but still has very poor occupancy. So imagine how disaster would be direct AC train from Nagpur to Amritsar considering there is no much traffic between these two cities?? That's why I think it can be extended to NED. I am sure in future it will be.