This... this is a song about growing up. You see, there was that book, a story for kids by Gianni Rodari, ugh "The Blue Arrow" I guess, where Blue Arrow was a train's name. So, this song features an image of that train but, really, it is about growing up.

... вот поэтому я обычно загадочно улыбаюсь и ничего не объясняю