Image courtesy London Transport Museum (www.ltmuseum.co.uk) © Transport For London
There are dozens of great tube websites, queen of which is Annie Mole’s brilliant london-underground.blogspot.com a daily underground diary.
Diamond Geezer has an annual tube week packed with facts at diamondgeezer.blogspot.com.
Clive’s Underground Line Guides (www.davros.org/rail/culg) is a scarily detailed history of each London tube line.
The London Transport Museum (www.ltmuseum.co.uk) does the official thing well, while TfL’s own tube section (www.tfl.gov.uk) is very useful, with great stats hidden in its ‘corporate’ section.
www.alwaystouchout.com allows you to stay up-to-date with transport projects in London.
Mash-ups of the Underground map are frequently threatened with legal action by an over-protective TfL, but there are some crackers online at owen.massey.net/tubemaps.html, www.simonclarke.org/lul and www.geofftech.co.uk/tube
Finally, there are great two sites on ghost stations: www.abandonedstations.org.uk and www.underground-history.co.uk/front.php