I've been meaning to scan this, and finally got to it this morning. It's an old track diagram of St. Croix Junction in Hastings, Minnesota. You can see on this one where the MILW used to cross over to head up to Bayport. http://www.railimages.com/albums/timdiez/aaq.jpg Tim
Looks like a page from the old Milw interlockings book. Hope that's what you have. Some really neat info contained in that book! Boxcab E50
Does that person have the Interlockings Book? Maybe they can copy it for you? A "commercial" reproduction of it can be purchased. Although the issue being copied, is lacking some pages. The price I feel is somewhat inflated. But..... Boxcab E50