Bob, if I may suggest. Remove all #5 turnouts in the lower quadrant. After coming across what may be the stair case come off the main line and go into a three way wye. Left leg goes back to the main, the middle and right leg feeds the mill and foundry. Coming off the tail of the three way points, a LH curved turnout will give you a track into the Seaboard team track and a connecting track back into the main line. Consider NOT using the full size 20" Atlas #5 for rejoining the main. That one product uses a lot of real estate.
I would suggest to install a curved turnout in the five o'clock position of the curve on the bottom right hand of your track plan above. Understand the Atlas #5 is sized for newby's to use the Atlas track planner which replaces two 10" pieces of snap track. Only the far right hand #5 below is original full size. A full size #5 can be clumsy.
Check out the surgery
