bhai ji aap train ballygunge se nikal rahe ho to sealdah par idhar se koi direct route nahi hai north se south ki taraf me aapko agar sealdah main route express line pakadna hai to Ballygunge se passing line leni hogi jo direct narkeldanga ki taraf nikal jaega sealdah nahi jaega aur fir udhar se sidha express line aapko mil jaega.