Nikki Marmery: Network Rail's historical legacy and government guarantee make it an unusual credit. Can you describe the company's background and structure?
Samantha Pitt, head of corporate finance at Network Rail in London: Network Rail runs the infrastructure that allows the trains to run - the tracks, the signals, the bridges, the tunnels etc. We are a private company: we don't have shareholders. We have members instead - representatives from the rail industry, such as train operating