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. It has been updated periodically since then. The latest update came on 13 July 2015, when the site was ported from the now-discontinued Proximobus API to the MBTA’s official v2 API. This change brought in subway, commuter rail, and ferry locations in addition to buses.