MBTA scheduled to announce real-time arrival info for every last bus line

State transportation officials and Gov. Patrick gather at the Ruggles T stop this morning at 10 to announce the availability of next-bus data for all 187 MBTA bus routes. The data is used by a variety of apps to let riders know when the next bus on their route is expected to show up. The T started releasing public bus-arrival info as part of a pilot project last fall.