Here is a pdf showing turntables (mostly) in Indiana. http://madisonrails.railfan.net/turntables_2.pdf
I thought they were very short tables when I first looked at your list, then I saw the date, 1912, before the B4 had any "real" locomotives, i.e. H, J, K, L, etc...
Roger, you continue to have a treasure trove of New York Central history. I am sure some of those had to be replaced with longer ones once the big locos that Hank mentioned came along.
