Nice work, Jimmy. Really nice pixel art made within the tight Flickgame constraints. My favorite moment here is when you see the city from inside the train, after seeing it from outside the train--a really nice change of perspective on the same object.
Are you happy with this as it is, or would your ideal version of this game poem be slightly more involved? If you were going to add another two or three frames, or another path of interaction, what would it be?
Small point: I think you should add a clear ending to the game, or else make it loop around.