Hogwarts International School
I used my projector to trace the train onto black bulletin board paper. I then painted the details and printed off the Hogwarts Express Label from http://www.therpf.com (thanks Barneyrfd). I used a Ferrero Rocher gold wrapper for the light on the front of the train. Finally, I glued the train onto a big piece of flat cardboard to make it more sturdy and durable. Since we just moved into a new building, cardboard was in plentiful supply!
Platform 9 3/4
The Hogwarts Express
I know what you're thinking. And yes, everyone keeps trying to run through the brick wall.
I used two rubber ears and some wire to make my own extendable ears. I saw something like this when I visited Zonko's at the Wizarding World of Harry Potter this past summer. I figured it would be a fun detail and a way to remind students in the hall that we can hear them.