Here's the idea then. The APA box we are all familiar with. If not, review this other blog posting.
A Google search for "British Oak coal disposal point" will reveal some remarkable pictures to whet your appetite.
Trackplan wise there's not an awful lot you can do in 25" x 11" and given the industry the plan sort of suggests itself. One road to deliver empties to which are then picked up by a small shunting loco to be loaded at the screens. Yes, really loaded. (You know my beliefs about how small layouts should have working features to keep peoples interest up.) before being returned to the front road to be collected and sent off to the rest of the railway system.
As I got to thinking about this basic idea my attention was caught by my DMIR stock and looking at pictures of loading screens on both sides of the Atlantic I realised they aren't all that different and one structure could easily cover both locales. As this rendering shows.
I like this idea.