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On one level was an exhibit/Expo which was pretty lame.
However, it did have a nice model of a cog train so you can see roughly how it works.
The cog near the front pair of wheels turns and pulls the train along.

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Picture info:
Date: 2007-09-24 15:46:11   Camera: Canon EOS 40D
Focal Length: 10.0mm   Shutter: 1/15s   F/8   ISO: 1250   Flash did not fire