Earlier quoted context omitted.
The seperation of track ownership and operation from actually running the trains is mandated by EU directives, so that part is going to be the same pretty much anywhere in the EU. I think some countries like Germany bend the rules a bit by having them run by nominally independent divisions of the same state-owned company (and sometimes go father than is allowed and end up on the losing end of court battles), but the…
What is the EU's reason for that rule?
This would happen to the point where it was almost impossible to organise cross border rail connections.
By seperating the track from the train you can make the train companies compete with each other on a (more) equal footing.
Ironically, most of the 'private' train companies now running on UK tracks are actually Dutch, German and French state owned railway companies competing with each other.