- thetube.com
 - Official site for the London Underground. Features a London Underground journey planner, tube maps, online tickets, realtime service updates, and more. - Clive's Underground Line Guides
- Describing the London Underground system and the independent railways of the London area - the Docklands Light Railway and the Croydon Tramlink.
- Describe Online: London Underground Stations
- Guide to underground network of The Tube.
- Jubilee Line Extension (2)
- London Railways
- Information on the history of London's railways and Underground network.
- London Station
- Hand-coloured photographs of the London Underground, and a selection of traveller's tales.
- London Underground Engineering Services
- Developed to support its business activities.
- London Underground Railway Society
- Organises meetings, publications, events, and more for the study of London's underground rail system.
- London Underground Tube Diary
- The musings of a commuter in London who uses the Underground regularly.
- London's Abandoned Tube Stations
- Photos and information on the city's abandoned tube stops, and overground lines.
- Metronet Rail
- Consortium of five companies responsible for upgrading, replacing, and maintaining two-thirds of London Underground's infrastructure including its trains, stations, signalling, track, tunnels, and bridges.
- Tube Refund
- Offers assistance in reclaiming money from London Underground under the statute of the Citizens' Charter.
- Tubeplanner.com
- Includes an online journey planner plus station, fare, and tourist attraction guides.
- Ultimate Guide to the London Underground
- A collection of hints, tips, and rants about the London Underground.
- Underground History
- Comprehensive guide to the abandoned and disused London Underground stations hidden beneath London streets.
- What People are Saying on the Tube
- Collection of overheard quotes from Tube passengers.
- Wikipedia: London Underground
- Hyperlinked, in-depth article on the London Underground, also known as The Tube. Includes history, present network, future plans, and information on the July 2005 bombings.
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