Absolutely right, Mayner, you've reminded me of a couple of other places I saw them.
I wasn't aware that any survived to get the standard CIE brown (red-oxide).
I suppose, for historical accuracy, we need to be aware that we now have proof of them in both CIE liveries. Thus far, the red.... we all know of examples of where incorrectly applied liveries, or incorrect recollections, fuel theories that something was a certain colour, when it wasn't. It's so easy for a modeller who hasn't had the requisite number of birthdays, aches and pains, to assume that if the UFTM, RPSI or DCDR paint something tartan, then it must have been tartan. Not so, as many examples in all three can show us. So - one wonders where Alphagrafix got their information from? Was it reliable information, and if so, did their printing process produce it correctly?
Their SLNCR coach, for example, is red. It should be deep maroon, although that one's understandable as the very few coaches on this line that saw a paintbrush in the "colour" era (Nos 4 & 11 spring to mind), faded to a weathered nondescript browny red colour in the Leitrim wind and rain quite quickly.
Red would be colourful on a layout in world of almost all grey. It MIGHT be accurate. However, if realism is the preference, we at least know grey is accurate. And post-1970 or so, brown with broken wheel too.
Incidentally, for all wagons, the brown started appearing about 1970. Prior to that all grey. By the time loose coupled stock was done away with in the mid 70s, about 60% of stock was brown! the rest grey still! the odd one still sporting a "flying snail" stencil.