Thanks for the replies! So all of the warm places like the southern U.S. had their ice shipped from the North, and the North saved it up all year from the winter? That would be a lot of ice, for the whole country. Must have been a huge industry!
My Dad told me that the best manual labor job in the summer was working at the ice factory, for obvious reasons. Beat the hell out of roofing or being on a road paving crew.