The MBTA announced Tuesday that it would extend service on all subway lines “by about one hour” on Fridays and Saturdays starting Aug. 24. Trains now typically begin their final runs between midnight and 1 a.m.

Nine years after pulling the plug on a prior weekend late-night service program, the MBTA this month will begin running all subways and several popular bus routes about an hour longer into the night. It's part of a new fall schedule that also boosts daytime trip frequency across most of the system.