i think its not a bad move to start the new trains from kolkata station. personally i like that station. its clean, not at all crowded. and sealdah is already having to deal with many trains with hardly 2 platforms (the rest are mostly used by local trains). however i accept that getting to the station is an issue as there are no buses or autos from the nagerbazar road to the station and walking distance is like 10 mins which is difficult with luggages. but taxis are available whenever the trains arrive. the drivers are aware of the timings and hence come to the station as and when trains arrive. Heard that a new road is being built by the railways from bidhan nagar station to kolkata station to enable passengers to reach the station easily (cannot say for sure)