The Air Line State Park Trail is a rail trail and linear state park located in Connecticut. The trail is divided into sections designated South (25 miles: East Hampton to Windham), North (21 miles: Windham to Putnam), and the Thompson addition (6.6 miles: Thompson to the Massachusetts state line). An additional 3.6 mile spur to Colchester is sometimes designated as part of the Air Line trail. At the Massachusetts state line, the trail connects to the Southern New England Trunkline Trail, a 22 mile long trail to Franklin, MA built on the same right-of-way.