@ Ulytau: "Jamiet, are the rails privately owned or only privately operated?"
They initially privatised the rail infrastructure itself, as well as the trains, but in the form of a seperate company to the private train operators. Unfortunately the infrastructure company, "Railtrack" tried to please shareholders by massive cost-cutting, resulting in serious compromises on safety, which culminated in several fatal rail crashes for which Railtrack was found liable. The government, realising what a disaster the privatised, profit-motivated rail infrastructure was, forced Railtrack into administration, set up a new arms-length, not-for-profit company called Network Rail which now looks after the rails, and does a much better job of it. Technically it's still a limited company but it has no shareholders and isn't allowed to pay dividends - any surplus must be re-invested in the railway, and the final legal control over it's actions rests with the government - what's technically known as a "stautory corporation".