"People see color with significant variations. In Japan, there are more than 5 million people in total who see color differently from ordinary people, due to their genetic types or eye diseases. Color Universal Design is a user-oriented design system, which has been developed in consideration of people with various types of color vision, to allow information to be accurately conveyed to as many individuals as possible."
I have yet to see this label on any other publications, but I will definitely be happy the day that train lines and other similiar types of charts/guides that use a lot of hard-to-decipher colors adopt this system. CUDO also has an interesting blog (Japanese only) with photos of how the system is being incorporated into things like street signs and recycling bins.