OK - I reworked my plan and was able to maintain my original design but added a reverse loop for the "inner mainline" on the right side of the layout. I also added a siding to the outer mainline near the yard. The red track starting on the left side will incline at a 3% grade until it reaches the upper left corner then will remain level (across the top) until it reaches the upper right corner - then will decline at 3% to the end of the red track in the lower right corner.
Any feedback will be appreciated!
