The route I took heading to my insulator club's swap meet at Nisswa took me down a county road that happened to carry a long 7200V line out of the rural sub near Dayton Hollow. I now see why the main transformer was so big! Anyway, this was a real surprise to find! One, Westinghouse transformers are rare on Otter Tail, two, this was a 7200V unit, third, there was a second one not far away!