Trackernet

Trackernet (stylised TrackerNet) is a system operated by Transport for London, some data from which is available to the public in the form of Trackernet's data services. These services can be used to obtain real-time predictions for entire lines, more detailed predictions for individual stations, and information on station and line status. Trackernet only covers London Underground.

TfL's unified API is more suitable for many use cases (and is actively maintained), but omits operational data which may be of interest.

In the documentation, URLs are given with an example prefix (e.g. http://example.gov.uk/TrackerNet/PredictionSummary/C), the domain must be substituted (e.g. http://cloud.tfl.gov.uk/TrackerNet/PredictionSummary/C).

Documentation

https://content.tfl.gov.uk/trackernet-data-services-guide-beta.pdf