Lost wallet somewhere between around Heuston Station Area

Had my wallet when paid for coffee at St Patricks Hospital at 1:15. Got 2:15 train from Heuston Station to Newbridge (Portlaoise train) but did not use wallet again. Noticed it's not there at 3:30. Went straight from Pats to the train as just made it.......already had a ticket and nobody was near me on the train. It is a dark silvery grey, quite large....more like a clutch size than a wallet with a silvery buckle on the front.