That can't be the reason. Districts of Murshidabad, Birbhum, Far Flung areas of Bardhaman are more than 200-250 kms from the capital . Still entire South Bengal more or less dependent on Kolkata for Outward Travel, be it North or South India . I would not agree to that ! North Bengal Cities gets connectivity as all major stations lie on the Main Line to NEast.
Running a SF train will never hamper. HWH AZ MLDT already has SF trains to Guwahati and AGTL Raj will run via MLDT BGP JMP with tracks enabled for 110 .
Yes,...
more... am not vouching for each and every train but at least one or two trains can definitely take that route.