By Chris Lisinski, State House News Service May 27, 2021 Chris Lisinski, State House News Service With ridership creeping up to its highest levels since the pandemic began, the MBTA will boost frequency on its subway system and more than two dozen bus routes next month, officials announced on Monday. A new summer schedule that takes effect on June 20 will run Red, Orange, and Blue Line trains at close to the same frequency they did in the winter before a package of unpopular service cuts hit, plus deploy more Green Line trolleys on the C, D, and E branches. During peak travel time, riders should expect headways between trains of five minutes on the main center “trunk” of the Red Line, down from 5.5 minutes this spring; 10 minutes on the Red Line’s “branches” after it splits to toward either Ashmont or Quincy; seven minutes on the Orange Line, down from eight minutes; five minutes on the Blue Line, down from 5.5 minutes; and anywhere from 7.3 to 8.5 minutes on each of the four Green Line branches, according to an outline of the new schedule MBTA Deputy General Manager Jeff Gonneville presented Monday.