Ralph, not sure what era you are modeling or area.
I thought i would tell you a bit about the Duluth steel mill complex that was shut down in 1973.
The mill complex was huge and included both open hearth and blast furnaces,Rolling mill, wire mill,coke plant and alongside of it (also owned by USS) was the Atlas cement plant an obvious natural for the coke plant vicinity.
Serviced by the DM&IR,the Steelton yard area was a very busy place for decades,especially around WW2.
Other RR's served and interchanged the mill including the NP,GN,SOO and Milw(to a lesser degree from what i understand)
Operations potential for the steelton yard,highline,mill and cement plant alone would be enough to keep any modeler and friends happy for a long time to come.Considering that other manufacturing facilities also existed in the area,several roads interchanged and the scope of the actual mill operation itself,dont miss out on this as a potential prototype opportunity.
Heres an ariel view for you.
