[ardecila]

CN owns the tracks on which Metra's North Central Service runs. Due to CN's purchase of the EJ&E, most of their through-Chicago trains will be diverted from this line. The tracks will not be totally abandoned by CN, but a greatly reduced number of freight trains will allow for a more robust Metra schedule on the NCS, including a potential O'Hare express train (if coupled with a People Mover extension).

In Forest Park, the south end of CN's line connects to CSX's Altenheim Sub (owned as part of the B&OCT). Although CSX owns this line, it connects only to CN tracks on the west end in Forest Park, and I believe CN is the sole user, through trackage rights. CN's purchase of EJ&E means they will no longer be using this line, allowing it to be abandoned and possibly used for transit purposes or highway expansion. I doubt CN will continue to pay for trackage rights on a line they no longer use, and without that revenue, CSX will no longer wish to maintain the line.

There's also a short stretch of CN-owned track between Franklin Park and Forest Park that will also be abandoned by CN.