The inside of the tunnel is made from foam board.
The tunnel is curved so a MDF template was made to the correct curvature.
The roof is made in 7 wedge-shaped sections .
This is the tunnel nearing completion.
The foam board tunnel was spayed black inside. Concrete was poured over it and slabs bedded on the top. Eventually the tunnel will be covered in earth and turves.
A train emerging from the newly completed tunnel.
A view through the tunnel showing the refuges.
A view from the opposite direction.
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