Large Z scale layout built in modules. Each grid box is 1x1 foot. Entire footprint is 5x12 foot rectangle. No duck under - I would crawl to get to the inside. I see it as 4 main sections. The rail yard on the bottom The two vertical sections have spurs for industries One long horizontal section on the top would scenery focused Specific questions: I imagined the trains running clockwise. Should the spurs branch off in the direction of traffic. I imagined the trains back into the spurs to pick up and drop off freight. Any critiques of the rail yard? I haven't built a flow-through yard before and based this off of yards I found online.