The network owned by Railtrack is being sold off to a new, 'non-profit' organisation called Network Rail. Warburg and associated banks will provide the £9bn as a bridging loan, and then refinance this through a bond issue later this year. 'Where the fees really come in is in the bond issue,' said a source close to Network Rail. 'The figure will be around £30m.' Warburgs is in line for up to one third of that. It is being paid a further £5m as Network Rail's financial adviser. The bank could not be contacted at the weekend.