At one time I had all of the drawings for the Milwaukee Road rotary plows in our office, I maintained the "book" that had all of the details on them as well as the original 8 X 10 negatives of them from when they were built. We used to borrow the negatives and make contact prints for ourselves. Those were the good old days. I never heard what happened to all of that stuff when they closed the Milwaukee shops a year after I got laid off. I sure hope it got donated to a museum somewhere.