MassGIS says it's a CR, which often/usually in situations like this  have easements for the public.   At least the last recorded CR I read did.   But, being owned by other than the government doesn't argue that there isn't a trail.   It's been edited over multiple years with specific access tags, which makes it look like local editors have been thinking about it.

Feel free to reopen and explain how the data on the map is incorrect, and if so please explain what the CR terms are in terms of public easements.