The Fort Hill Recreational Trail is a 9-mile long multiuse trail that is built along the old Boston and Maine Railroad. The surface is crushed stone and gravel, so it is not suitable for road bikes.
I did take my road bike along here - 25 mm tires. There's mud, and crushed gravel, and a wooded bridge (see pic). So it is doable - if you need to do it. You won't be going 20 mph, and wider tires would be better (30mm+) but it's better than the road, which is kind of narrow at this point.
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