Seems to me there are very few people satisfied with manufactured paint schemes. Lionel seems to have seldom got it right, going back into the 50s. MTH isn't that much better. Canadian Pacific colors on 40s/50s diesels in gray/maroon have never been close on the maroon, which always looks more like brown. Anyone who's seen originals gleaming in the sunshine knows CP maroon, both reddish and rendered in glossy tone, not flat.
But, maybe the real issue is closer to: what excuse do builders have to NOT replicate real schemes? I think "#90" above hit the nail on the head about color chips not being sent, or if sent, the analysis was wrong right off the color chip. Don't makers understand the first thing anyone sees is the color of the item right out of the box? 
