This is a simplified reproduction of an official Harry Potter "Hogwarts Express" Christmas ornament.
The more I worked on it, the more I could see discrepancies between the Christmas ornament and "the real thing". Nevertheless I stayed as close as possible to the design of the ornament rather than the locomotive seen in the movie.
Should you desire to correct the discrepancies, or begin anew your own model, I recommend starting from the "Olton Hall" blueprints. This is the actual locomotive used in the movies.