You are permitted to get down at Thane and travel with your PUNE-Dadar Ticket up to Ghatkopar by suburban local train. Please note you can do so from Thane to Matunga only (one station prior to Dadar up to which you are having Mail/Express train) by suburban local train.at 20.30 hrs there will not much rush in train. Please catch slow local at platform no. 4 at Thane Railway Station.