Infographics that give a little insight into the history of public transport(ation) in the UK.
Live Google map of trains running on the London Underground, created using the Transport for London API. From the makers of the highly-useful accessible, bookmarkable UK train timetables.
Recent work in London's Notting Hill station uncovered original advertising posters untouched since the late 1950's (via).
Disused Stations on the London Underground - they're there, but we don't see them. This site gives a list of places to spot glimpses of these mysterious stations, as well as details of stations that were almost built. Fascinating for a Londoner, and perhaps something to look out for if you plan on visiting the city.