You may notice that a 3wide train is a bit of a novelty in NI racing and you need to be handy whereas in the SI every race has its inevitable 3 wide train.
Best place to be in NI is in the 1 out line but in SI the 3wide train ensures that anything in the 1 out line will inevitable end up out the back.
I dont know that they run trials persay in the NI...Mostly just workouts whereas in SI Canty and Sthland they have workouts and trials which with the extra "Level" so to speak trainers have to bring there horses to race fitness level.