A new website maps the real-time position of every single London Underground train across the UK’s capital.

The site was built in two days by Matthew Somerville using new data released by Transport for London.

“It’s surprisingly okay, given this was done in only a few hours at Science Hackday on 19/20 June, and the many naming/location issues encountered, some unresolved,” Somerville writes on the site.

The transport data had only been available for a week when the site went live, a graphic example of the speed with which such sites can be set up.

Somerville has also built a similar live-updating map for from all the major stations in the UK using data taken from the National Rail website  – which begs the question, is mapping the new domain of trainspotters?

Campaigners in the UK have been waging a long battle with institutions to get taxpayer-funded data put on the web for all to use.

Tim Berners-Lee, the godfather of the internet, has been spearheading the campaign, with map data from the Ordnance Survey the next target for online distribution.