Rick has covered it well. My comment on colors on the old displays that pop up here and there is that you frequently are seeing significant amounts of fading so tough to judge in some cases. CTT did a special issue on displays a few years ago and it was pretty obvious how one display differed from another even from the same year. Some of these were displayed in stores or hobby shops while others were in private homes in a windowless basement.
When I did my D-105 I played around with the base color for the track bed and roads. Originally it was too white and finally found a cream that looked good. And for my “Lionel green” I used Behr’s Park Picnic which I think works well.
https://www.behr.com/consumer/ColorDetailView/P390-7
