>>882890>>883455They are owned by the Escanaba & Lake Superior Railroad in the Upper Peninsula. The owner of the railroad, John Larkin, is a railfan himself and owns (and operates) a small collection of old (mostly Baldwin) diesels and other equipment.
At some point in the 1980s some people broke in to the shed and stole a bunch of shit off of the Sharks, leading to the railroad to adopt an anti-railfan stance (everything is kept under wraps, photography and trainspotting is discouraged, etc).
Larkin is a member of a rail museum in the Upper Midwest, and some have alleged that the equipment is set to go there when he dies.