http://www.bbc.co.uk/news/magazine-18032721
the above explores the hypothesis that in Greece, it makes economic sense to close the railways and subsidise passenger transport in taxis. The article provides a UK comparison, which suggests that when 4 persons share a taxi, the cost of a train vs the cab is the same, in terms of cost per passenger km.
all the UK's railways are subsidised to a greater or lesser extent - the latest available figures are here -
http://www.dft.gov.uk...-indicators-input-01/
UK Railways. A continuing good deal for the country? or an outdated expensive burden, whose subsidies would be better spent on the roads?