Still in the planning stage, though hopefully beginning the construction stage before too long. I've modified the plan from the expansion point of view. I'd like to build it in such a way that the HCD can be incorporated into a larger layout without too much modification. Here's the result:
And here's what I have in mind (thus far) when it comes to a future expansion:
I don't know yet what the bottom section will look like, but will almost surely involve extending the mine branch to another loadout or even a large-ish prep plant, while the mainline will loop back on itself to allow for continuous running. But that's looking well down the road. For now the central 36x80 section will keep me busy for some time to come.