Under the process introduced by the Railways Act 2005, the government and Scottish Ministers define the scope of the railway they wish to buy in their respective High-Level Output Specifications and how much they intend to pay in a Statement of Funds Available. ORR then determines the income Network Rail requires to deliver these outputs over a five-year Control Period.rnDeveloped during a period of uninterrupted economic growth, this process assures NR's income for the five years of the Control Period. This replaced the situation before privatisation where the government could instruct British Rail to cut back expenditure and investment when the national economy was under pressure.
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