If you are easily offended by extremely poor wooodworking look away now.
You can understand now how it's not easy to fit anything in due to the varying heights and close proximity to the edge of the crappy chipboard top of the traverser deck.

The thick lumps of brass are copy font from the pantograph engraver. They're spares and with weird symbols on that I don't even recognise, never mind have a use for. They are drilled, pinned and loctited onto lumps of plywood. Each will have a brass tube soldered on, through which will pass a brass rod to act as a bolt. My soldering iron is a puny 25w thing, so I'll have to drag the RSU out and put the earth to each plate to have any hope of soldering the tubes on. A set up similar to this will be added to the sector plate at the other end of the layout.
There is one more hateful woodworking task before proper operation of the layout can commence and that is to put up some stock shelves above the FY at the other end. I have far too many wagons to be able to keep them all on track.
The operating system is by picking 7 wagon cards at random, 7 being the maximum that can fit in the run-round loop. Each card gives the wagon's identity and whether it comes in from the BR exchange sidings loaded or empty as there is of course loaded traffic both ways. Some wagons only ever come in loaded and only leave empty, such as minerals but these can carry either scrap metal for the furnaces, or coal for the boilers. The choice of empty/loaded and choice of load will be done by toss of a coin.
The cards are laminated so can be used again.

The layout is basically a glorified shunting plank but the card system means there is purpose to it and the randomisation means the same wagons with the exact same loads and destinations are highly unlikely to make up the same train twice. Except for the wagons that run as a block and always to the same destination and with the same load, of course. They being the fuel oil tanks.
And the Pig Iron opens.
And the limestone hoppers.
And the sand wagons.
So, apart from the tanks, the Pig Irons, the limestone hoppers and the sand wagons, everything is different every time.