The Amtrak train station in New London CT is about a mile from campus, with cab service at the station. Boston's Logan Airport, and Newark airport in NY both have good Amtrak connections.
Van service is from TF Green Airport, in Providence, RI, TBA.
The Greyhound bus terminal is right next to the train station (New London, Union Station).
For a complete list of transportation options including buses, trains, ferries, and taxis, see the New London Historic Waterfront's website: http://www.newlondonmainstreet.org/pub/listing/viewall/transportation