Looking at the traffic arrangements for the Tall Ships festival, there are huge restrictions on road access. Rail access therefore will have an equally huge advantage, and let's see if IE management are up to the task of exploiting it. If the don't come up with something big, then all my suspicions about their utter incompetence will be justified.
They might even offer a series of short out-and-back riverside cruises by train down to Bellview to coincide with the arrival and departude of the ships.
Alas, I'm not optimistic, but I hope I'm wrong.