We went on a tour of a model train display that is in the back yard of a man's house in Mesa. The trains all move throughout the yard on a maze of tracks. There were about 7 or 8 different trains going at the same time, through tunnels over bridges and mountains. Everthing is computerized, when two trains are meeting each other, one stops and lets the other by and then the track switches and the other train continues on. It was pretty amazing.
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