I love how it uses the original SimCity helicopter, train, and a lot of the same tiles.
https://donhopkins.com/home/images/SimRefineryHelicopterAndT...
There is more stuff actually implemented or at least sketched out wireframes in the menus. Stuff like Refinery => Operating Plan => Blender Recipes => Gasoline => R32 that pops up a "Blender Recipe" dialog with a lot of numbers and petrolium techno-babel in it.
https://donhopkins.com/home/images/SimRefineryBlenderRecipe....
https://donhopkins.com/home/images/SimRefineryFeedstockAvail...
There's some more interesting stuff in the interlinked windows you get from Windows => Unit => [bunch of different stuff], that brings up dialogs like "Crude Unit" or "Asphalt plant" that shows the graphics and inputs and outputs of the unit, along with some inexplicable tables and diagrams and measurements, and squares that you can click on to link to other windows showing all the different inputs and outputs. And the unit windows all even have "Help" buttons that pop up a blurb describing them.
https://donhopkins.com/home/images/SimRefineryCrudeUnit.png
https://donhopkins.com/home/images/SimRefinerySulferPlantUni...
It implies there's some kind of a data flow model going on, but I guess it's probably mostly just wireframe examples of what it would look like if there was really a simulation going on.