The first five weekends after the change will see commuters riding for free on all train, ferry and bus lines after 9pm. The MBTA says most buses and trains will run every 30 minutes during the extended hours. Red line trains between Alewife and JFK/UMass will run every 15 minutes.

The MBTA will soon be adding late-night weekend service to subway lines, as well as popular bus routes in the Boston area.

To introduce the new hours, the MBTA will offer fare-free service on five Friday and Saturdays nights after 9 p.m., starting Sept. 5.