Ed,
I lost your thread in the move, but have found it now.
As you can see, a three platform minories, with above the third platform a parcels platform and siding. An arriving parcels can run straight in (or into the passenger platform), a departing parcels is made up and placed in the top passenger platform for departure. I have added a loco release crossover in the platforms - this works for short trains, but longer expresses are taken out by a new train loco. To give an idea of scale, the bars below are 12" and 3" in OO.
Paul.