Bengal pushes everything for Kolkata area.. They doesn't want to develop other cities. All other states does...
Example: AIIMS in Kolkata Area, IIM in Kolkata, Now IIT Kharagpur Kolata Campus in New Town. Capital city, Metro Rail, Rail Zones all Kolkata only.
Other states: Capital: Ranchi, IIM Ranchi, IIT Dhanbad, AIIMS Deoghar.
Capital: Raipur, Rail Zone: Bilaspur
Capital:...
more... Mumbai, Metro Rail: Mumbai, Pune, Nagpur.
Capital: proposed near Vijayawada, Rail Zone proposed VSKP. Like waise all states parallelly develop 3-4 cities, Bengal could have developed places like Kharagpur, Durgapur, NJP etc.