The proposed Squannacook River Rail Trail is the name for the former 1847 Peterborough & Shirley Railroad that was abandoned in 1981. The Squannacook Greenways, Inc. acquired an easement from the MBTA in 2015 to build a stone dust rail trail. Construction of the first phase started in November 2019, so it is colored gold. It will run from Depot Street in Townsend center to the Bertozzi Wildlife Management Area in Groton.