Layout 4+: We have expanded the layout space two feet to either side, and adding a 4' by 4' extension on the left side.The fourth of our smaller layouts is expanded from the spurs, still using 15" curves. We make a freight yard to the right. To the left we have added a loop and a couple of cut-offs.
A yard is added inside the upper left, while a long spur extends to the lower left.
If you want even more sidings for a yard, add switches along the spur.
Layout 2+" we have expanded two feet to the right, and added a 4 ' by 4' extension to the right top. We use the sidings to extend to a loop with a passing siding and freight spurs.
On the very right, we add more switches to make a complex freight yard. If you like switching operations, this one's for you.