I have a suggestion...
...for your building Gary.
I worked in Paterson for a few years at a foundry. It was right on Railroad Ave. about 1/2 mile from the yard. There was a track that crossed the street into a loading dock. I modeled a kitbash of a smaller version in N and hope I can find that building.
Anyway- we made house lamps- brass palted zinc castings. We occupied a city block almost, an old brick building defineitely out of the late 1800s.
It seems to me the place was a foundry previously- we cast our own zinc in the foundry (120/135 degrees there in the summer), a milling depart ment, the polishing department, a brass plating room, on to finishing for paint/lacquer.
The finished parts went to stock. On the other side of the building the product was assembled, wired and boxed for shipment.
The different loads inbound would be zinc ingots on skids, barrels of anodes for brass and other types of plating, barrels and boxes of paint and solvents. Outbound are finished goods- boxed and stacked on pallets as well as the milled off trim from the castings, etc.
The other suggestion I have is a textile mill. You could call it Gary's Magic Carpets and have an O-Scale figure riding a Magic Carpet hovering over the building.
Looks great.
Mark