Here is 4x8 intended for operations, drawn in Xtrakcad by me, based on an excellent plan proposed by Linda Sand in the article “One plan, three options” in Model Railroad Planning 2002. Click on image below to see plan in a readable size.
A discussion of the layout:
A skyboard/backdrop run down down the middle of the layout, dividing the layout into two 2x8 scenes - a rural/semirural scene with a passing siding and three industries on one side of the, and a yard & interchange scene on the other half of the layout.
This also makes it possible to later cut the 4x8 apart along the bacdrop, and turn it into a 2x16 straight shelf layout or a 2x8 + 2x8 L-shaped shelf layout, with minimal changes to the layout - only thing you must change is the actual connection from end of 2x8 board to end of the other 2x8 board - the rest can be used as it is.
A possibility for continuous run with 22" radius curves.
Industry tracks are curved to maximize length. Industries chosen (team track, cattle loading/unloading pens and scrap dealer) does not need buildings to be modelled, and can take various types of cars.
The runaround on the industry half of the layout will allow you to run the engine around up to four cars - ie so you can pull or set out all the cars on any of the industry tracks (which have capacities of 3 or 4 cars) in one operation.
On the yard/interchange half of the layout, there is a small yard, with tracks that take 2, 3 and 4 cars respectively. A yard lead, capable of holding the engine and 3 cars is also provided. Engine plus 4 cars if you just want to clear the first turnout inside the actual yard.
Runaround allows you to run around up to three cars.
Two interchange tracks, representing “points east” and “points west”.