Thanks. Yes I know but its easier to repaint white than to cover black. I didn't know about repro tracks, but I got a used set that arrived today from a FABO member.
you have to go to a neutral beige or grey first depending on what color the top coat will be. From black to blue go to grey 1st, from black to red go to beige 1st, from black to white either will work. I would go beige. Beige is the factories neutral base color for molded plastics to be dyed.