I grew up in a segregated state. As a kid, you don't ask...that is just the way it was.
It was history. My interest in that era is confined to center baggage door "Jim Crow" combines. My mother used to visit an aunt riding in the "Jim Crow" combine on a mixed train branch line in Kentucky. I have modeled one, planning to use one end for coal miners traveling to and from work, and the other for the general public (ladies shopping in white dresses who might not like seats covered with coal dust) to take into the big city.