John, Your first attempt at something in SCARM is better than mine was. 
My thinking is if there is one reversing loop, then a second is needed to reverse back again, otherwise, why bother. However, other folks see it differently and are quite happy. My plan is a loop to loop, with the loops folded on top of each other.
I downloaded your plan and I see track level 1 which I take it is the subway route. It makes sense. I'll leave more analysis to the big guns. I'm a cap gun or pop gun when it comes to track planning even though I have run trains for 50 years. 
