GTFS-realtime provides live alert, vehicle location, and arrival-prediction data in an industry-standard format. GTFS-realtime is best for retrieving data for the whole system at once in a relatively small package, but must be extrapolated using the agency's GTFS data to be meaningful. See Google's GTFS-realtime documentation for more information on the GTFS-realtime format.
New GTFS-realtime Files Coming Soon
The MBTA plans to introduce an enhanced version of our GTFS-realtime feed soon. Some of the data currently only available through the API will be available in that feed. Watch the MassDOT Developers Forum for more details.