Not Possible....Maitree Departs At 7:10 AM....And Railway Counters Open At 10:00 AM.... May Be You Can Travel To Esplanade And Book One Of The Transit Services By Shyamoli, Des Travels, Shohag
Another Option Is Come To Sealdah And Board Bongaon Local....Reaching Bongaon Jn You Will Get Auto Rickshaws Who Will Take You To Border....Cross The Border And Board Benapole - Dhaka Semi Non Stop Express. Also There Is Benapole- Khulna Commuter Train. Get Down At Jessore And From There You Can Board Chitra Express ( Day Train) & Sunderban Express ( Night Train) To Dhaka
All...
more... Information Are Given Considering The Fact You Already Have Bangladesh Visa