RIDOT's most recent State Rail Plan revision has a bucket list item for a new joint study with MassDOT by 2025 for Boston-Woonsocket via Franklin-Blackstone. To be done as follow-on to the '07 study which had no MA participation and some routing assumptions gerrymandered around that MA non-participation which were flawed and now need an acknowledged correction in a fresh look. MassDOT hasn't responded with whether they'll partner-up (still early yet), but since official state rail plans are the decade-level planning docs of record for the Feds used for indexing grants there's no chance RI stuck that item in there without Stephanie Pollack's foreknowledge and at minimum a "We'll talk."Woonsocket is already a potential extension to the Franklin Line, so it's definitely possible. RI would have to pay for it.
Providence-Woonsocket as a service blending of trunkline RI intrastate service is already well-studied and a "when" not "if" whose timetable is only dependent on how slowly it takes to first fund-design-build their remaining NEC intrastate intermediates. Providence-Worcester, a deeper-future study wishlist, is the only one I'd say is extremely far-fetched to be seeing pre-2040. The other two with Woonsocket as a major multimodal hub are both reasonably-priced and tasty-looking on leverage to either state.
It is zero coincidence that BSRC scammer magically appeared from the shadows of an Arlington Center law firm's P.O. Box when the Draft RI Rail Plan was first circulated for public comment. Though it looks like his latest reincorporation scheme in NH has been torpedoed by securities fraud, so he's probably done-done this time.