Ok, Dive...!
Their reference to CIE / NIR "2600 class" is not right - the GNR, UTA and NIR never numbered them, or called them that....
Ok - first off - the UTA ones. Light grey roofs should be dark grey and valances at bottom were black, not green; though the UTA like NIR ran them without, ie with the engine showing.
CIE green - the shade is wrong and the roofs are light grey again - should be black, though some might have the very front bit in green as discussed earlier.
GNR - the blue is way too light, more like what they had on locomotives. It should be very dark blue, verging on navy; actual example may be seen on the Fintona Tram at Cultra. The lettering is the wrong colour and style.
The black'n'tan version is fine, though lacking CIE logos on the sides.
I know that for economy's sake, it's a "repaint" of a British railcar - fine - not everybody, unfortunately, can afford the more high class models, and it's good that Silverfox recognise this. But for any manufacturer, it's a shame to see something as absolutely elementary as the colour of something, poorly researched....
I'll trawl and post some photos later (just out of books - any "real" ones I can put my hand to are black and white).
I'm truly and genuinely not on a rant about silverfox - I completely respect and support any manufacturer who enters the Irish market - hardly a business decision guaranteed to make them rich. In my day, Irish modelling meant paper overlays on Hornby Mk 1's! But just looking again at their site, their "G" class have livery errors too. Green G601: should have green chassis, not black. Silver version: silver roof, not black. Black, and black'n'tan versions: the white band is way too thick, and there should be a silver or white colour on the small strip of beading round the front of the bonnet.
Overall, "tan" looks too orangey and probably is closer to the post-1990 shade. Having said that, I'll qualify it by saying that I haven't seen one of these "in the flesh".