GSR, the lining the GSR used only on the 800 class (with a lighter green than CIE) was yellow and black. CIE used only white and black. I think that one 400 class may have appeared in green with no lining, judging by one photo I saw, though it was in a filthy condition. But CIE only used gold as edging on the "eau-d-nil" (light green) lining, numerals and "snail" logos.
As an aside, we often see pale yellow "snails" on steam era model in grey livery. This is incorrect, and had probably come about as a result of the more obvious pale yellow used on large cabside numerals in CIE times. For grey (or rare post-1955 black), while numals are light yellow, tender logos should be "eau-de-nil" lined in gold. And, the light yellow cabside numbers were not lined in gold, or anything else!
Obviously, CIE lining was post-1945, which is when CIE was formed.
The "snail" was invented for and used by the Dublin United Tramways Company to replace their old garter logo in 1941. When the DUTC was amalgamated with the Grand Canal Company and the the GSR (road and rail sections*) to form CIE, they simply copied the DUTC logo, the "flying snail". Thus, the "snail" was never used by the GSR in any shape or form - at that stage it was a different company's logo.
(* The GSR had a "road" section - buses and freight haulage - by 1945, as a result of having taken over the Irish Omnibus Company some years earlier).