Changed it to a Howe pony truss; which looks to be correct from the orientation of the diagonals in the pictures. I think I just defaulted to a Lattice at first since there are so many on the former Central Mass.
These bridges are hard to classify, but it could be a Howe (as opposed to double intersection warren), but I can't tell from the couple little photos. Its definitely not a lattice though, since lattice implies a warren with triple or greater intersection.
I'll defer to your expertise since I've only seen pictures of it; though it does look a little more like a double-intersection Warren pony truss to me. I'll also update the entry to reflect the rail-trail conversion.
I believe the upper hardwick rr bridge is a iron howe truss bridge, not a lattice truss bridge. I am currently repairing it for the EQLT.
It is open to pedestrians, bikes, horses, wheelchairs and is open to snowmobiles in winter to the Ware River Snowmobile club.