I would be dead against nationalizing the railways.
Years ago (while still nationalized) I remember waiting at a station near Whitby on a bank holiday for a train and it never turned up.
I had to wait about 2 hours for the next train, and when it arrived I had a moan at the ticket collector on the train about the "missing" previous train.
He said that on bank holidays if there are no customers the train will get to the station earlier than the published time, which is why I missed the previous train.
When I said that was not good enough he just shrugged his shoulders in a sort of "hard luck, but I don't care" sort of attitude.
And that is EXACTLY what is wrong with nationalized industries, mostly they just don't care.
At least (some) of the current train companies do care, and generally provide a decent service. If they are bad they will lose their franchise.
I am old enough to remember when we had nationalized industries like the GPO, the Gas Board, the electricity board and so on.
If you wanted a phone back then you could wait weeks or months for one, now I can walk into a phone shop on my High St. and get one the same day.
It could take days or weeks to get someone out from the Gas Board or Electricity board.
Sorry, but going back to nationalized industries would take us back to the situation as it was in Soviet Russia during the cold war.
But of course some in the Labour party want that, which is why they will never get elected with that sort of leader (which suits me fine).