GBR needs full control of freight for the following really rather obvious reasons imho....in no particular order:
1. GBR cannot be a guiding mind deciding where and when to priortise one type of traffic over another on state owned infrastructure, when one type of traffic is a fully subsidised state run affair, the other a privatisation era market led effort.
2. The provision of internal network services at peak efficiency.
3. National security of key flows, notably steel and fuels, old and new.
4. The efficient procurement of rolling stock. If GBR will be reaping these benefits in passenger orders, it will reap them in freight too.
5. Innovation in economic growth. The market alone has consistently shown it cannot innovate quickly enough to meet rapidly emerging opportunities and changing circumstances. It always requires massive injection of public funds and expertise. So cut out the middle man.
6. Planning. GBR being a public body with strategic importance, can be prioritised by planning departments, with it being quite obvious that rail freight is heavily dependant on bricks and mortar, or indeed, steel and utilities.
7. Intermodal switch. It is high time we recognised that cost is not the only factor in how we move goods of less than trainload weight. So with a state provider of perfectly functional intermodal services of strategic importance, such as supermarkets and industrial manufacturing, it becomes more morally acceptable to compel the likes of Amazon to either be part of the solution, or pay handsomy for using public roads and low paid workers in such daftness as the mass transport of plastic junk.