There's a lack of comments anyway (I regularly think it's getting to a point of zero posting
).
Anyway, I like this. In higher resolution you'd see the tracks better too. You might zoom in a little more (get lower) and give the camera a slight angle to get more depth in the train, making it visually go faster. Did you manage the dirt?
@Nils: I don't think (fairly sure, actually) that wouldn't work as we only have camera blur. But it would be great if that could work for a lot of objects. Perhaps if you move/animate the camera and the terrain and all, except the train in a similar way, then you can blur the train.