Art Space Sculpture

Below, is a picture of an idea I have been thinking about for my space sculpture.The idea is a train on rail road tracks. If I end up doing this sculpture it will consist of 5 parts.
Part 1: The last car, a circus
Part 2: The second last car, a coal car
Part 3: The second car, a passenger car
Part 4: The front car, the conducting car
Part 5: The bottom, the train tracks and grass