A new timetable has been introduced on Dublin Bus route 53B (that operates as a private hire to Irish Ferries for ferry foot passengers) which sees additional journeys each way between the Ferryport and Heuston. Link:
http://www.dublinbus.ie/en/Your-Jour...-Connections1/
Previously there was only one early-morning journey in each direction between the Ferryport and Heuston.
This new timetable only seems to have come into effect in the last week or so.
It is a welcome development which should make SailRail a more appealing and feasible option when travelling to/from provincial destinations. Stepping off a train at Heuston and onto a dedicated bus to the ferryport is streets ahead of a fragmented trip across the city entailing possibly being a standee on a LUAS and waiting at Busáras for the bus to the ferryport.
PS: nice shot there Sealink of the HSS!