The layout the boys created was very simple so they could to run their electric train on it. The elongated loop has wide curves to prevent the train sticking. At the top the placed a set of points and then created a long siding with a bridge to take it rover the bottom of the loop.
There are a couple of embellishments to the design including the tunnel and the additional two bridges in the siding, which serve no purpose other than make the train go up and down a bit.
The sad thing about battery trains is that they really need a circle and often special points to work properly, which dampens the creativity quite a bit.
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