When I rode cross country (LD) trains back in the 90s, a large percentage of on-board crews were Afro-American men. I remember one trip in 1990, an annoying old passenger from Mississippi who was at my dining table told me I had tipped the dining car crew too much. The crew appreciated it, though, and showed me their appreciation the next time. I remember those crews for how warm and friendly they were. That's thirty-three years ago now, so all are retired or passed on.