It was exciting to travel in the GMS behind 5917 for the great race, but I can relate to not getting much of a view of the other trains. Comparing the great videos I shot on previous 'races" when there were only 2 trains, seperated by tracks like when 3801/3830 raced, I think that these gave passengers a much better view of a steam loco at speed. The 4 locos side by side are a great spectacle for tracksiders, not so good for passengers.As far as I can tell, the four trains were side by side at Warabrook where I was, but not so much elsewhere from the photos, but the whole train would have to be clear of the adjacent trains for a good view of the others. But that should have been clear to anyone who had seen the area before. The view of the race was always better for lineside observers.
As I drove to Maitland just after the trains, I saw dozens of people leaving every imaginable viewing point as I passed them. I think that is a big part of the "race", since many more people than could fit on the trains, often locals, can see the trains pass by.