Have both run and biked the trail several times. Biked most of the way, ran not so far. Some woodlands, some fields and past a few houses. Crosses the river on an old rail bridge. Nice rural route.
Have done only 1 RT in NH, in the southwest corner ending in Keene. They often provide a new view of familiar landscape. I bought a guide for the NH rails-to-trails several years ago but have not utilized it other than for the one above.
I see one near Keene every time I drive over there. Looks like an interesting climb over the ridge with a very deep cut at the top the road crosses over.
In VT there's an interesting one under development from St J to Swanton. Makes a long climb out of St J to Danville with wide sweeps back and forth across the hillside.
Looked up the name of the one we rode ending in Keene: Ashuelot RT, 21 mi. We took 2 cars so it was a bit labor intensive. Starts on Rt 63, north of Northfield Mt.
I noted that Vt has about 130 mi of rails-to-trails, NH some 460, maybe "agrarian" vs "industrial" in historical evolution.