It was the pre-55 green, as seen today on 800 in Cultra and several preserved CIE buses.
An exact sample (actual CIE paint) is on the “snail” on my logo on this site, which is a good quality (in terms of light) photo of the mounted flying snail displayed in Headhunters Railway Museum in Enniskillen.
Jhb171 Senior got this done in Inchicore about sixty five years ago.
Lining was the same EDN with black & gold lining, as on carriages and buses.
i stand to be corrected on this, but I’m nearly sure that ends were plain unlined green, as you suggest, with the lining on sides only (despite the whole vehicle being like a biscuit tin on wheels).
Carriages, on the other hand, had black ends.