I made this train over spring break of 2003, in anticipation of Ethan's coming home later that year. It is a "cho-cho train." The sides and ends of the cars are in the golden ratio and there is a "phi" on the front of the train engine.
Here is a picture of the train on a shelf in his room with his other toys. He doesn't play with it very much because his parents are afraid that he will break it. But it is a cheery, colorful addition to his room.