whitney-grove garage in NH on grove st. you'll get to see the construction shoring up the below-street portion where you will soon get the trail. for now, park there and cross the start of whitney ave and get over to temple street. on temple and just where the diagonal trail is underground it emerges just past that temple street overpass. you can see a footpath to walk/ride down onto the trail from there; that's the current NH start point. before you start you can spin around and see what it will look like peering through the tunnel/underpass in the direction where you came from- right under temple st and under whitney.