Well, under BR, anything ran, whether it made a profit or not, whereas under privatisation, it'll only run if it makes money, even if the service is required.
As others have said that's blatantly not true as many many services run that make a huge loss because the DFT stipulates they have to run. And as far as "service is required" is concerned why should a service be required if hardly anyone uses it?
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Chiltern haven't invested huge amounts, maybe in Chiltern's staff time & cost as NR has made the investment-
http://www.railpro.co.uk/news/business-news/chiltern-to-make-259m-investment-for-oxford-link
Yes so Chiltern are paying a premium for Network Rail to build the chord.....