Theoretically, you can take Boston commuter rail from Providence.
www.mbta.com gives the following itinerary:
Itinerary #1
Depart PROVIDENCE STATION At 05:15 PM
Route #820 - SOUTH STATION At 05:15 PM Map and Schedule PDF
Schedule
Arrive BACK BAY STATION At 06:21 PM
Transfer to:
Depart BACK BAY ORANGE LINE SOUTHBOUND PLATFORM At 06:27 PM
Route ORANGE FOREST HILLS At 06:27 PM Map and Schedule PDF Schedule
Arrive MASSACHUSETTS AVE STA ORANGE LINE SOUTHB At 06:29 PM
Transfer to:
Depart MASSACHUSETTS AVE & MASSACHUSETTS AVE ST At 06:35 PM
Route 1 HARVARD STA VIA MASS AVE At 06:35 PM Map and Schedule PDF
Schedule
Arrive MASSACHUSETTS AVE & COMM AVE At 06:39 PM
Walk NW to COMMONWEALTH AVE & MASSACHUSETTS AVE
Regular Fare Senior/Disability Fare Total Trip Time
$ 7.50 $ 3.25 84 mins.
> Hi all --
>
> I am traveling to Boston for TRASHionals and I have a free pass on
SouthWest. If I use the pass -- I cannot fly directly into Boston
but have to choose either Manchester, NH or Providence. Having been
to neither city, I was wondering if those who know New England
travel much better can offer some wisdom that I might not be able to
get at AAA.
>