The MBTA announced this morning it's lifted most of the speed restrictions on the Mattapan Line, but adds it still has "block restrictions where necessary," so not quite 100% back to being the Mattapan High-ish Speed Line.
Fans of more leisurely trolley rides can still hop on the Green Line, which remains a "global" slow zone as inspectors continue to look for both new track problems and old ones that the T isn't sure if they were actually fixed.