The West River Trail
The WRT is a 36-mile scenic (former railbed) all-season trail through the West River Valley. When connected, sections of the trail will link Brattleboro, Dummerston, Newfane, Townshend, Jamaica and South Londonderry.
Here is a website for the trail. I don’t have a phone number for them. Here is the page with mailing addresses for inquiries.
Lower Section Map Map of Upper Section
Description of the Lower Section from trailfinder, “The trail is flat, well drained, and some sections have been surfaced with stone dust. It is popular with runners, bikers (mountain or hybrid bike recommended), families, and those seeking a leisurely stroll.”