It was confirmed that Keolis / MBTA has increased the speed limit on several sections of the Worcester line to 70 mph. This was enabled by the improvements to the track and is part of their effort to increase on time performance (duh?). In any case, it sounds like they are continuing to tweak things a bit.
It has taken time to remove/rebuild/replace CSX's Track maintenance standards to MBTA's standards,figure on one more season of trackwork,
to finally get to "state of good repair" on this route.