Tube Updates provides a basic way for users to access the data from the Transport For London site. The unofficial API allows developers to instantly query what state the London Tube network is in. This also includes the Docklands Light Railway and features the individual messages that each line has in order to specify exactly why there is a delay or if any stations are closed, etc. Users can also search back through the various status changes over time so that they can build applications such as reliability graphs or time checkers. The API uses RESTful protocol and responses are formatted in XML, JSON or JSONP.
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