This is a little mashup which takes that real-time data and plots it on Google Maps. Choose a route from the pull down menu below and markers will appear with the latest locations of its buses. Markers will update with the latest information from the T every 10 seconds. Click on a stop marker to see predictions for when the next vehicle will arrive.
The original version of this site went up on 14 November 2009, one day after the MBTA first made this data available for buses. Version 2 was released 6 June 2010, which introduced stop markers and predictions. Version 3 was released on 13 July 2015, and switched to the MBTA’s official v2 API, which added subway, commuter rail, and ferry tracking in addition to buses.