There's none of your fancy-pants lightweight plywood construction around here - our base boards are virtually bomb-proof and built up on a solid foundation of best 2 x 1.
The nature of the challenge can be see in this photo of the back of the layout.
Until now the layout has operated with two independent yards with the upper one 7cm higher than the lower (Porthmadog) end and the whole assembly resembled a giant U shape.
What we're thinking at the moment is that we'll have a handful of loops which feed into the single track at either end.
According to my very basic calculations - and there's every chance these could be completely wrong - the gradient is 1 in 35 (7 cm gain in 250cm) which could prove interesting for Down trains which will have to climb back up the ramp again to get to the Blaenau end of the spiral!
Have a matching spiral behind the scenes?
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