This map shows all trains (yellow dots) on the London Underground network
in approximately real time (old screenshot).
I have a (per-station) National Rail version,
and an awesome bookmarkable train times journey planner.
Live departure data is fetched from the
and then it does a bit of maths and magic.
Some H&C and Circle stations are
missing in the TfL feed.
(with helpful hinderances from Frances Berriman and James Aylett).
Station icon by Tim Diggins.
Originally built at Science Hackday, June 2010.