The first attempt at a plan for the new configuration made circa 1990 using an early (pre Microsoft) version of Visio. The original boards remain at the top although the track plan is not accurate in this area.
A key part of this design was that the narrow gauge (black and purple) spiralled around and under itself and the standard gauge (light blue) and then dived behind the water tank (the shaded rectangle at the bottom RH of the picture). This narrow gauge all got built and remains to this day.
The standard gauge was also meant to spiral through tunnels and then over a Treffry style viaduct and then on hidden track under the main layout and around behind the water tank. This viaduct got built but it was clear the curves were going to be too sharp (especially in Scale 7) so the plan was altered and the viaduct sold.
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