-River Line (Camden to Trenton NJ Transit) has dedicated access during the day. Freight at night. Was the requirement imposed by FRA for using european trains.
-Amtrak has exclusive use of CSX Poughkeepsie to ~Albany during the day and pays for track maintenance and upgrades. Metro North owns Poughkeepsie to New York.
-Amtrak has exclusive use of large parts of its "North East Corridor" north of Wilmington, but south, makes money lettting freight on.
Some segments in midwest.