A live map which shows exactly where all the trains on the London Underground are at any given moment has been developed.
The website uses a combination of Google Maps and live transport data to show a map that illustrates the exact movements of every train on the Tube’s 11 different lines.
The map uses Tfl's live departure board information to calculate the positions of the trains. It knows when a train is any number of minutes away and when it arrives at a station.
Web developer Matthew Somerville came up with the idea after Transport for London (Tfl) removed its restrictions on commercial use of its travel data last week.
Has this been done before, like with other train/metro systems?