SpackleFrog
Smash showy bell-bottom pants and sporty haircuts
The first thing that stands in the way of rail nationalisation is not having a government that wants to do it. Get that government and opinions vary as to what EU rules would or would not allow, and what could or could not be done in the name of national interest. Then there is the political angle to this quite aside from EU rules, in which countries that already have nationalised railways would find it difficult to insist on rules blocking it for the UK. The UK would not be in a powerless political position. But the whole thing is moot until you have a government that wants to do it.
This I completely agree with. But given that what you've said is correct, why don't you focus on getting a left govt into power instead of standing on the side lines and - let's face it - whining like a child who has had their sweets taken away.