The Nashua, Acton and Boston Railroad was built in 1871. They built a railroad line between Nashua, NH and Acton, Mass which connected to the Framingham and Lowell Railroad (Bruce Freeman Rail Trail). The line was abandoned in 1927.
The Nashua & Acton Rail Trail is a set of existing public paths and proposed rail trails in Acton, Westford, Groton and Dunstable. In Groton it is sometimes called the Red Line Trail, in Westford it is named the Stone Arch Rail Trail.
map hosted at ARRT 