...at the second of the destination nodes, or the third diorama depending on how you have been counting.
On the entrance end of this rather long scene, the action centres around the rather infamous double-slip "curiosity switch" and an interchange yard. The area represents a junction between two railroad companies in several scenarios. Another station for passengers and a freight-house are lined up on the far side of the yard. Several of the street businesses reflect other interests as well as various friends I've had in this hobby. There is a garage specialising in British marques, an Army surplus store called "Sarge's", the latter and several other structures gifts from friends over the years.
Importantly, the two tracks either side of the interlocking tower (signal box) form one end of the obligatory passing loop required in this node.
Looking in the other direction, you can see how the running track enters this diorama from the previous one through the backscene.
The points to the left of the signal box represent a line headed off to "the rest of the world beyond", purely visual and soldered into position so the illusion doesn't also result in stock launching off into the aisle.
Further up the line is another freight-house where cars are unloaded and the shipments are sent out for local delivery. The reverse is, of course, also true.
Moving on, we come to this large grey and green coldhouse where shipments of fruit and veg are unloaded and stored for distribution to various stores and supermarkets. You can see an old long-abandoned platform where boxcars used to be spotted for one-time receivers of the contents. In those days, you could even order a complete kit for a house from companies such as Sears, delivered in a boxcar to the "public delivery track". You or a contractor then unloaded the contents onto a truck, hauled it to your site, and put it together.
On this end of the scene, petrochem figures large in the traffic scheme.
Also here, a lumber distributor receives cars at the platform where the white boxcar stands. The contents are then hustled off by fork-truck to the grey building inside the fence.
In general, then, an urban terminal operation where cars are both delivered to and picked up from the customers in the area. Each time we operate formally, the stock is changed out to represent a different railroad company that ran in the American northeast and a chosen year within the era of 1960-1980.
One benefit is that allows me to keep building more individual models of stock even though the layout is "done". When you think about it, it actually is a problem for a model builder type to finish a layout dedicated to representing one railroad prototype; once you've stocked the finished layout, you're kinda done building models for it.
The other important benefit is each change of scenario also features different tasks and different scheduling of trains so no-one has said they are getting tired of it yet.