IIRC the MILW used the B&OCT to access their Southeastern division. Use to use
In 1973 things changed a bit "However, this sleepy status changed on March 1, 1973, when the line was extended from Bedford, Indiana, to Louisville, Kentucky, with acquisition of trackage rights over the former Monon mainline. At first the trackage rights to Louisville weren't of much use, since in 1973 The Southeastern was in great disrepair, and The Milwaukee did not have the required reconstruction capital. To solve this dilemma, in 1979 the railroad forsook its own right-of-way north of Terre Haute, Indiana, in favor of trackage rights over Conrail's former New York Central (Big Four) "Egyptian" line, which ran the length of the Illinois-Indiana Stateline from the south-side of Chicago, through Terre Haute, all the way to Cairo, Illinois. Actually Conrail's track north of Danville, Illinois was not much better than The Milwaukee's, but the two railroads could then split maintenance expenditures on one route, to help turn a profit. The Milwaukee Road's trackage between Terre Haute (Spring Hill Tower) and Bedford was substantially rebuilt to complete the Chicago-Louisville route." Not sure how they accessed their own lines after 1973.
Bring back the Slumbercoaches!!