This post is about a subject that I read about several years.
I have read that railroads in the south used "colored" (black) fireman, but those fireman could not be promoted to engineers, even though some where better engineers than the white ones.
I hope I have not offended anyone by this post as history is not always kind.
Happily retired NP-BN-BNSF from Minneapolis. Yes, I was there as of M-Day in 1970.