Even in Japan, the country of train nerds, platform screen doors are still everywhere

Although even in new builds, they prefer half-height doors; likely cheaper to build but with most of the full-height doors' benefits

commons.wikimedia.org/wiki/File:Yu...

Most of the stations are accessible already, the deep blue dots aren't very legible from a distance (or blurry internet pics)

Maybe it's time to do a reverse, & only mark the stairs-only stations instead