Sunday schedule for certain. A handful of low ridership buses do not operate at all on a Sunday so check the schedules. Bus and Subway transit will be at 15-20 minute headways (between trains). The commuter rail will be on a 2-hour headway. While bus and subway will operate till around midnight and some after that, the commuter rail will be taking their last runs between 9 pm and 11 pm in general. Again, schedules will give a better insight. Just go to the MBTA web site and locate the bus or train of interest and it will lay out the schedule.