...customer London Underground. Tube Lines maintains the trains, tracks and stations for the Jubilee, Northern and Piccadillylines which together carry almost two million passengers a day, 40 per cent of those using the entire tube network. ...
http://www.uk.capgemini.com/news/pr2000/
...Underground. It is responsible for the maintenance and upgrade of the infrastructure on the Jubilee, Northern and Piccadillylines, including all tracks, signalling, stations, bridges, embankments, trains and tunnels. A massive investment...
http://whitepapers.silicon.com/0,39024759,60673631p,00.htm