Here's an idea to improve operations and eliminate the unnecessary rhombus at the top of your plan. Remove all four of your crossover switches in the middle of your passing siding, and then reconnect the two sides using just one straight piece of track in each passing siding leg. Then use the four switches to create two two-track interchange yards, one on the outside of each side with a loop. Now, your railroad can be a connector between two Class 1 railroads while still serving some industries along its tracks.
Chuck
