John_F wrote:
From what I remember about blast furnace metallurgy, the model is missing the ore, flux, coke feeders that fill at the top. The design appears to be of latter vintage that used high top pressure. The reason Pittsburgh across the Monongahela River from US Steel's Homestead Works became reddish brown was with no HTP a lot of hematite got blown to the winds.
Actually, the high line is behind the blast furnace and the bridge with the skip buckets runs up the back side of the furnace as you can see in this old photo. Like most model railroads, mine is always undergoing changes and improvements. This photo was taken before the cold blast line and other details were added.