If it wasn't for private companies chasing a return on investment you wouldn't have had the network we had/have in the first place. Can you imagine if developing the rail network from scratch had been left to the dead hand of government.
This rather glosses over the fact that the vast majority of those private companies chasing a return on investment spectacularly failed to do so.
Grouping in 1921 came about because most of those companies were losing huge amounts of money. They were amalgamated to stem the losses and to rationalise the network into something more coherent.
Nationalisation came about in 1947 because even the Big Four couldn't afford to refurbish their networks without money from the dead hand of government.
The Lumo ECML service is a case in point - much hated by OA haters, but there is no suggestion that in the absence of an OA, those services would have been provided by the incumbent.
In the case of Lumo, I think it is fairly clear that LNER would have provided the capacity.
The amount of actual capacity provided by Lumo is relatively inconsequential at 6 trains each way per day from Newcastle to London. LNER have three trains per hour from London to Newcastle, to offer some perspective on that. And the trains themselves are relatively small trains.
However, the existence of these paths has created other timetable problems elsewhere on the ECML. I don't know whether it is fair and informed comment or not, but the Lumo paths have been cited repeatedly as one of the reasons why Durham now has such a terrible service.
The extensions to Glasgow Queen Street wouldn't have been provided but, at the same time, is one southbound train at 18.18 of much utility anyway?
My view about Lumo's WCML service is pretty similar.
I disagree with those who are stuck on the point that Open Access is solely abstractive and removes from the existing railway, without considering the wider sector growth that it enables.
I don't think OA is solely abstractive. Even Lumo isn't solely abstractive.
Hull Trains is an OA operator which I would say is largely generative and would stand on its own two feet even if it wasn't allowed to call at Doncaster.
Grand Central is more of a mixed bag- it has generated growth from Bradford/Halifax and from Hartlepool/Sunderland but I think it is fair to say that it wouldn't be economically sustainable if it wasn't allowed to call at York and Doncaster.
Lumo? Its entire business model is based on revenue from Edinburgh, Newcastle, and Preston to London. Perhaps its business model might attract some new people off the plane (although I'm sceptical, no matter how much First hammer this point) but it appears to be largely abstractive.
The real test, for me, is whether these OA companies would be profitable if they had to pay the real cost of accessing the rail network rather than paying the subsidised access charges. I happen to think Hull Trains would be. The others? I'm not convinced at all.