Personally, despite my aversion to historical inaccuracy in liveries, and ongoping frustration at the fact that the majority of preserved items in Ireland are not correct in this regard; I actually thought that looked quite well! Even if they HAD been blue in traffic, this blue is a bit too light, plus the "G" and the "N" on the tender were way too close together, but there ye go!
I confess, as a teen, to painting a model green BR railbus in BR corporate blue with yellow ends, a livery they never carried. To railbus fans, I apologise and prostrate myself accordingly. The things teens get up to....
My only steam recollections were black GNR locos, either in GNR livery or UTA black; and dim recollections of a filthy dark grey CIE loco, probably an old J15.... and withdrawn CDR locos, yes, with RED domes, NOT black!