I think my liking for the original yard was that it had more of a sleepy branch line look to it. It really does remind me of a lot of the trackage I've seen on logging style layouts. What I like about it... 1 storage track that is probably never full. A run around for short trains with a long lead at the end on the left of the drawing. I really like the long lead because a lot of model railroads are designed for the space they are in to maximize available real estate, but real railroads don't worry about that. A two track engine house. A spur for storing cabooses or cranes or another engine. There is a lot about your mainline design that reminds me of the track plans I used to see in model railroader from the 60's and 70's. I guess it would be best described as HO 4x8 on steroids. I still like those kind of layouts. Odd thought... You could invert the plan and have the staging at the top of all the grades sceniced and completely visible. It could be a division where the two trains meet and crews get changed out, who cares if they spend a lot of time parked there. I am curious to see what happens to the design over time. I've seen many layouts start out as one thing and then evolve into something completely different.