West Bengal, without any doubt. Here are some points to suggest this:
1. There are a lot of points that can be mentioned about Howrah(HWH) station from the available options for any part of the country to facilities, the revenue generated by this station etc. Apart from HWH, SDAH and KOAA(that maintains international train) should not be ignored. Other stations in he state like NJP, Malda, Asansol, BWN, KGP etc have also got a widespread Railway connectivity.
2. Kolkata, the capital of WB is the former Indian capital, one of the six metropolitan...
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cities and most populous cities in India.The city houses some major company bases like ITC, Britannia, Bata etc. The rural area has got developed agriculture sector which is at par with the other mentioned states, at least. The presence of places like Darjeeling, the historical city of Kolkata itself etc supports tourism sector of the state.
3. Education scene of this state has got premier institutes in the picture, like IIT, ISI, IIM, Jadavpur University, IISER, NIT to name a few. The sports sector of this states is again at par with other ones with Cricket and football being most followed sports. WB hosts international cricket matches and is also important football hub of the country. There are some major steel plants and industries in the Durgapur-Asansol belt that largely supports economy of the region.
And many more!