http://cgsc.contentdm.oclc.org/cdm/landingpage/collection/p16040coll3
Jack Greene, game designer, noted that there are some studies of railroad strategy in the American Civil War here.
This site looks to have a big assortment of military studies on all kind of subjects.
Thanks for the post. I think I have that one bookmarked (there's a few of these that look very similar) but glad to have a fresh look at it either way.
O0