TD

The Train Describer feed provides low-level detail about the position of trains and their train reporting number through a network of berths. Usually, but not always, a berth is associated with a signal - but there are locations (such as terminal platforms at stations) where there may be more than one berth. From each berth, there are zero or more other berths which a train description may step in to. A step between berths represents movement of the train from one berth to another. Some of these steps may be one-way, some may be two-way.

To access the TD data feed, you must select and subscribe to the appropriate geographical topic(s) on the My Feeds page on the Data Feeds website (see the about the feeds page.)

See also the list of train describers page.

= Topics =

ActiveMQ topics are provided for signalling in specific geographic areas, as well as a topic representing all TD data in the country.

= Message types =

The Train Describer feed has seven message types, split into two classes. See individual pages for further details.


 * C-Class Messages provide information about train describer berths and descriptions
 * S-Class Messages provide signalling state information