The biggest by far is the Delphine (see Humber story), known locally as a Brexit-buster which Afloat adds joined leadship sister Celine which earlier this year was christened in the Irish capital and was officially launched onto the Ireland-Europe service.
(The pair) sail to and from Dublin and Zeebrugge in Belgium and Rotterdam in the Netherlands, avoiding the need to stop in the UK.
If all the parking lanes on the boat were laid end to end, it would stretch to almost five miles. It can accommodate 600 lorries and is almost twice the size of other ferries using the port.
Eamonn O'Reilly, the chief executive of Dublin Port Company, said shippers need certainty.
"'Just-in-time' is sometimes mistaken for as fast as possible," Mr O'Reilly said.
"But 'just-in-time' is more about reliability and I think we will see a considerable volume shifting from the UK land bridge onto direct routes to continental Europe."
For further reading on the issues and challenges faced by the implications of a hard-Brexit in addition to opportunities click here.