A future government would buy duplicate fleets of trains to avoid using the Rosco's existing stock? That'd be a real money saver...
Considering a large fraction of the ROSCOs rolling stock is nearly worthless life expired junk that isn't a major problem.
You wouldn't buy anything pre privatisation for example.
Also note that unless the ROSCOs seriously lower leasing charges on the old trains, reducing their fair value for compulsory purchase purposes, they would certainly lose out when the economics make direct ordering new changes cheaper than continuing to lease the old ones.
And Andy Burnham is saying he would simply not issue more franchises - luckily for him that I doubt there will be many franchises expiring between 2020-2025.
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The profit margin is actually quite small - NR accounts for the vast majority of expenditure and is non-profit making. The average TOC makes a 3% margin and, being in a position to know, I'd say it's saved considerably more than that in efficiencies since BR days.
And yet real terms cost per passenger mile has not fallen despite the obvious economies of scale in carrying more passengers on the same amount of railway track.
Any 'efficiencies' compared to BR working methods (like what really?) have more than been wiped out by madness like the Delay Attributation board, who debate such salient points as whether a bird is large or small.
Additionally the TOCs have an interest in reducing their apparent returns, both for political and practical reasons - so I don't trust their margin figures.
They will likely include big payments for things like brand licensing fees like all large corporate operators.
What BR might have done is of course unknown, but when I see the general state of public procurement (and that includes NR) then I wouldn't hold out any hope of nationalisation saving money.
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That depends - if you systematically go through and dismantle the vast majority of the bureaucracy you could save lots of money.
But dismantling such things is almost impossible once they are in place.