Maine
Mountain Division Trail
A 4 mile paved Rails-With-Trail starting at the Maine Visitor's Center in Fryeburg, Maine and ended near the airport. Another 6 mile section is completed from Windham to Standish, along with a 1 mile section in Portland.
The East Coast Greenway is a 3000 mile route from Calais, Maine to Key West, Florida. The vision is to establish this route as completely off road. At present, 31% of the route is on recreation paths and greenways. Consult their website for the route through Maine, Massachusetts, Rhode Island and Connecticut. New Hampshire is working on its section: New Hampshire Seacoast Greenway
The Eastern Trail is a 65 mile segment of the East Coast Greenway. The trail starts at Bug Light in South Portland and goes south to Kittery. About 22 miles of the route is off-road on hard-packed stonedust rail trail and paved bike path.
Vermont
A 15 mile hard packed stone dust rail trail from St Johnsbury to Danville. Another separate 17 mile section was recently opened from Morrisville to Cambridge. Eventually this trail will cross the entire state from St Johnsbury to St Albans.
Another long distance rail trail in Vermont, this 26.4 mile hard packed stonedust trail extends from St Albans to Richford.
The Island Line and Burlington Vermont Bikeways
A true gem in Northern New England. The Island Line trail goes atop a narrow marble causeway on Lake Champlain. This is the closest one can get to walking (or riding) on water! It connects to the Burlington Bikeway for a 12.5 mile spectacular ride.
Massachusetts
Northampton to Amherst for a total of 11 paved miles. The 8 span Northampton Lattice Truss Bridge spans the Connecticut River and is a highlight of the trail. Connects to the Manhan Trail and Northampton Bikeway.
Easthampton, 6 paved miles, connects to the Norwottuck Branch Rail Trail. Eventaully, this trail will connect to the Farmington Canal Trail for a trail system extendig from New Haven, CT to Amerst, MA and eventually to Boston.
Ayer to Pepperell to Nashua, NH, 12.3 paved miles
Lowell, Chelmsford to Westford (6.8 paved miles), now being extended towards Acton.
A 3 mile paved section, the northernmost completed section of the Farmington Canal Trail
A 6 mile paved section of the Farmington Canal Trail that starts right at the MA-CT state line.
Connecticut
Over 40 paved miles completed in various sections. This trail will extend for 84 miles from New Haven, CT north along the route of the old Farmington Canal and railway. The trail enters MA on the Southwick Jog then the Columbia Greenway Rail Trail, and will connect to the Manhan Trail and Norowttuck Branch Rail Trail.
Rhode Island
A paved 14 mile path that heads south from Providence to Bristol close to the seacoast.