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A unique duplo train tower. It uses bridge halves to raise the track up more
than four levels, around at the top, and down again.
I had to do some changes part way through the design when the engine started
clipping the supports on the corners. I needed to move the supports one stud
away from the track edge to allow room enough for the engine. I also needed
to adjust the clearance in a few spots where the the start of a bridge brought
the engine too close to the track above.
Here is a top view of the tower from the 3 stack side.
