I've always had a romantic image of trains, and this piece came from that. I sat down with a simple two cord rhythmic track and improvised over it over and over until I got the mix of organic improv and key correct melody that I wanted. That is a very complex way of saying, I kept trying over and over until I stopped screwing up.
Trivia: The original version featured a looping soundbite of train wheels clacking on the rails as percussion. But everyone other then me hated it. Also that one sounded as if it recorded to rubber band via garbage can.