On to the next module

The next module to be built is a 6ft straight module combined with a 2 ft inside curve.
Modules built to S&SSofNC specs are designed to fit together on a 2ft 'grid'.
This grid is referenced off the front edge of the module closest to the double track mainline.

So for example a four foot 'inside' curve has a 48" radius on the edge of the module closest to the 8/10 mains.  The 'inside' refers to the fact that the radius of the outside edge of the module is less than the radius of the 8" main. The radius of the 8" main on an inside 4ft is 48" + 6" = 56"  

An outside four foot curve then has a radius greater than the 8" main so - the outside radius is 48" and the radius of the 8" main is 40".