I take any pre-election policy statements / commitments / 'promises' with a pinch of salt.
Certainly Labour's commitment to 'renationalise' appears to be a half-arsed and poorly considered attempt to bring the Railway back into public ownership with freight remaining in the private sector, OA operators still plying their trade and stock still leased off the ROSCOs. Hardly 'renationalisation' by any accepted measurement.
Freight is in Open Access hands in most (all?) of Europe, even if some of the operators are from next-door's state-owned setup.
A minority of passenger services are similarly in open access hands in many countries, notably where new lines have been built.
Much rolling stock is leased Europe-wide and is a routine business investment model.
I don't think rail has figured at all in the main election debate - the main Labour proposal pre-dated the manifesto.
In Wales, Plaid want £1 billion from Westminster as Wales' share of HS2 spend, but the UK gov will ignore that.
We'll soon know what a Starmer Labour will do with rail.
It will be a bumpy road, I expect, while they get to grips with the issues.