I had to make a sample of Mine Songs for an upcoming press feature. I have no idea of any of this will make it into the 'final' version (which is a long ways off!), but it was a good exercise.
In this you can hear sounds from Duluth. The container at the old Duluth Works site (where US Steel was located), a distant train running from the CN docks to the Iron Range, the sound of cars on the aerial lift bridge (that allows laker ships to access the ore docks), and the engine of a BNSF train (which hauls to Superior, WI). Duluth was/is obviously very important to the iron ore/steel industry, even with the dissolution of the steel plant here.