There is no real substance for the viewer to grasp onto besides "oh the style is pretty" and this is kind of "mysteriously cool".
After watching it several times, I fail to remember much, if anything memorable about this show. The show arranges itself in a convoluted, albeit interesting way. Many individuals with separate stories and backgrounds are brought together by mysterious circumstances on a train to nowhere (ok, it is going somewhere).
That being said, that's about where the "interesting" part of the mess of a story ends. It seems like the author had some great ideas for small short stories. Not having enough material to create stories of their own, they were thrown together with the weak premise of "oh these people got on a train together and mysterious stuff is happening".
If I really wanted to watch something enjoyable with a train in it, I'd watch Thomas the Tank Engine.
