In this country 'nationalised' is heavily associated with 'rubbish'. and British Rail was widely derided. In a social media/24hr news world GBR is going to take a battering.
It doesn't have to be rubbish though, and a properly integrated organisation with joined-up-thinking and clear deliverable goals with a passenger-first attitude can most definitely not be rubbish. The 24hr news cycle makes everything seems worse than it is, including the railways as they are now, so that shouldn't really be a factor.
There is if they do different things, and if you want them to have local 'ownership'
What different things would they be doing? Running trains and managing infrastructure will be the basic services provided, and realistically there isn't much else you can or should do beyond that. For what it's worth I also wouldn't want GBR to have split ownership between regions. Maybe different areas of operations and management to cater more to a region's needs, but certainly not full-on ownership.
If the name is damaged then revenue will suffer and the Treasury will be on their backs.
I reckon managers will find that the DfT/Treasury is a much harder task master than shareholders! And the political expectation will be huge.
If GBR is structured like SBB or DB then the government
will be the shareholders. But the truth is passengers don't really want much from the railway beyond a reliable affordable service, which with clear goals and proper management is not exactly a pie-in-the-sky expectation. A single unified GBR brand will help make things simpler and more integrated.
I'd wager that almost all the commuter services in the country might end up not being run by GBR, especially if the likes of Thameslink are gobbled up by Khan (as he seems to want).
In that sense, GBR will only ever be running InterCity, and non-metropolitain regional trains. I'm not really actually saying anything specific here, simply that the scope of GBR's branding operation will be smaller than that of British Rail.
You make a good point. We might end up with a network similar to Switzerland where as well as SBB there is also operators such as Sudostbahn (SOB) that are jointly-owned by the cantonal and federal governments. As for GBR, I do agree that some commuter networks should remain devolved.
I think networks such as the London Underground, Overground and Merseyrail should remain local, but I'm not quite sure about Thamslink or the Elizabeth Line. Maybe joint ownership like the RER network in Paris that's split between RATP (which for those who don't know is the Parisian transit authority equivalent of TfL) and SNCF.
The subject of the structuring of GBR is a different topic all together so I won't go into it too much on this thread, but all things considered I still believe a properly integrated and single-brand would be more beneficial than having many different ones across the network wherever possible, obviously with some exceptions such as Merseyrail.