Got this train into Dublin on Saturday. Of all the days to have to travel up

I'm not sure where it came from, it was on the online timetable, it wasn't that full.
Got a seat, lots of rugger fans in good form. All good so far.
Except it was 5 minutes
early leaving Portarlington station. Which is a bit nasty considering the day that was in it - lots of train travel newbies, and the next one's not for 1.5 hours - and they're
never meant to be early.