The things that make KOAA the 'Not-so-preferred' option when compared to HWH or SDAH:-
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1) More suited for North Calcutta Locations
2) Tedious approach road
3) Mandatory overhead bridge crossing since Platform No. 1...
more... is meant for EMUS so tough for Senior Citizens/Specially Challenged and Ill passengers
4) Lack of adequate public transport in the absence of private vehicles
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PS: This is my personal opinion which may vary from other IRI Members... thanks.