This is the nearest we get to an organisational structure for GBR (1.7):
GBR will operate passenger services under public ownership and will be responsible for all services that are currently franchised by the Secretary of State or provided by the DfT Operator. It will be responsible for all rail infrastructure that is currently managed and owned by Network Rail and will own and manage the majority of stations. This includes those currently managed by Network Rail and by franchisees or the DfT Operator. It will also be responsible for delivering enhancements, as Network Rail does today. Crucially, GBR will unite track and train at a route level, with integrated management and joined up decision-making to support improved reliability, passenger and freight growth, and cost savings. This will also make it more responsive to the needs of local areas. GBR will differ significantly in this regard from models of the past such as the Strategic Rail Authority and will be set up to ensure the railway delivers for local users and communities, rather than focusing solely on the national level.
As expected, GBR will use the framework of Network Rail Infrastructure Ltd as its legal core (for letting contracts and managing the supply chain).
GBR will also use the NR Control Period mechanism for 5-year settlements, this time covering train services as well as infrastructure.
This means the full GBR model will apply from April 2029, with muddling through till then on current CP7 budgets and parallel TOC agreements.
GBR will have a full online retail web site, but in competition with 3rd party providers.
No separate GBR TOC web sites (but Scotrail, TfW, Merseyrail web sites will probably stay).
The interface with Scotland and Wales looks like reflecting the current devolved procedures.
Notably Wales is to be "consulted" about GBR matters, while Scotland is fully responsible for funding its railway.
Nothing said about cross-border services, I note (might be jointly owned in future).
Mayors get a stronger voice on local services but not necessarily the control and funds they seek.
The SoS will have the last word on fares.
National discounts (ie railcards) will continue.
No mention of HS2 anywhere (HS1 is not owned by NR/GBR).
There are only 20 questions asked.
I think DfT wants to limit debate and options.
I get the impression legislation is still a way off, and some of it looks complex (eg the driver licensing issues, consequent on the way Brexit legislation was handled).