The 4 comments under this newspaper article are quite interesting. The Metro Train route from Tollygunge to Dum Dum has many new CSTC Jan Buses (LHBs of the Calcutta Bus System) running nowadays along with Private Buses and Mini Buses so that load on the Metro Train can be reduced. I am not sure about the remaining stretch between New Garia and Tollygunge + the Dum Dum - Barasat stretch under consideration... thanks :-)
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NOTE: Log on to the CSTC Website to view numerous Jan Bus Routes from Santragachi, Kolkata - Chitpur, Howrah and Sealdah Stations to various locations of Calcutta :-D