Working models for the Bluebell Railway fun carriage

I was asked by the Bluebell Railway to make some working models that could be fixed to the walls of the fun carriage that they are creating at Horsted Keyned.  They are refurbishing an old elephant transporter carriage and will be filling it with interesting things for children to do.  The models that I have designed and created each demonstrate a different scientific principle  - Magnetism and gravity, Electricity generation and use, air pressure and centrifugal force.  The panels are approximately 60cm square and provide interactive play for all ages.