Ah that's so neat! I've noticed some of those details before, in how some of the segments of the display are shaped in various ways that lets them draw characters with smooth edges, in ways you wouldn't be able to do with a display where the segments' shapes are homogeneous.

As soon as I saw the first photo, though, I was a little sad to realize that it was of the old-style trains that are being phased out. The author notes this near the end, but I think that the trains are actually completely phased out as of a few weeks ago, maybe even before this article was posted.