East Gippsland Rail Trail : 100 Kilometres of natural diversity running from Bairnsdale to Orbost.

The Quinnipiac & Regicides Trails form a "Y", meeting near the summit of High Rock in Hamden, CT.  This route runs both twice, so you can start anywhere.  About 50 miles total.

Giff Walters submitted the route:

From the website http://warnertrail.org/
"The Warner Trail offers delightful and varied outdoor experiences as it stretches more than 30 miles from Sharon, Massachusetts, to the Diamond Hill State Park in Cumberland, Rhode Island. The trail passes through Sharon, Foxboro, Wrentham and Plainville in Massachusetts and through Cumberland, RI."
A Guide Book with detailed description of the route can be found at the above website.