Glenderg wrote,
The further I go down the rabbithole of this hobby though, the more I'm attracted to the late 30's era of State Coaches, Maroon and Gold lined carraiges north and south,
This would be NCC, presumably? Their carriage livery was the same as the LMS in England overall, though with some differences in lettering, fonts and numerals. Some older carriages were unlined, and there would have been more instances of carriages with no LMS crests than in Britain.
Not sure what "State coaches" would be? The GSR had a maroon (for post 1935 builds only at first, but later repaints of wooden stock) much the same as LMS, and identical lining - a yellow line below cantrail, another above windows, and yellow-black-yellow below windows.For a while they started painting main loine stock chocolate and cream with black lining, then reverted to maroon. Much older stock remained the very dark crimson lake (as seen on Downpatrick's 836 and 1097) until CIE. Thus a GS era layout would have much variation in carriages, despite (apart from 800-2) the absolutely universal sheep dip grey on engines.
The GSR painted stations dark green and cream. The MGWR used red and white (or possibly cream or light grey) on station buildings.
In this same era, GNR coaching stock was brown or scumbled, no lining, with most engines black, but a few old ones probably still in lined green, and the iconic blue livery appearing gradually after 1932.