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From OpenTFL
OpenTFL – opening Transport for London's data for public consumption
Journey Planner
The data Journey Planner provides is amazing. The interface it provides is slow, clunky, and horrible to use on mobile devices.
We want to open up access to the route data within it to encourage better interfaces, more specialised applications, and interesting mashups. We're not the only ones.
Journey Planner and its services
TrackerNet
On 15 June, TFL released 4 services on the data.london.gov.uk/apibeta website . This API was shut down again a few days later, reportedly due to overloading: Guardian: Live tube map halted as TfL hit by 50-fold growth in web calls - 10 million hits in 2 weeks. On 14 December it was reopened, behind a Microsoft CDN that is only updated every 30 seconds.
Although this is a different product, its data is derived from TrackerNet, and the documentation refers to it by this name.
TrackerNet services