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Privatisation under the current system is essentially a geography-based, government-endorsed monopoly, albeit on a much smaller scale than the creation of the Big Four railway companies in 1932 (hence the rising passenger numbers).
Nationalisation is straight up a government-run monopoly fuelled by those who don't even use the trains.
The only sensible way to fix Britain's railways is by going back to the days of Railway Mania and let the market decide which railways get to survive.