Chicago's commuter rail system is called Metra (operating code MTX).

They own some of their own rails. UP and BNSF operate 4 of their commuter routes. CSX owns most of a few of the Metra operated routes.

Once, I was delayed 2 hours on Christmas Eve by a 1 Mile + Long freight train that broke down while crossing our main line pulling into the freight yard south of O'Hare Airport. A victim of CSX's "precision scheduled railroading".

Back when Metra pre-recorded the automated announcements, they specifically had one for delays caused by "freight train interference". The freight operators don't give a flying fuck who they interfere with, because they are empowered to.