This rare double-deck covered bridge actually existed on the Boston, Concord, & Montreal Railroad
and was modeled from a partial drawing and a small amount of accompanying text. Internally this is a curved chord
truss design in which a pair of laminated curved beams are added to the basic framework for strength. The tracks are
on top with the roadway below. KUID 35412:38051 (MB_rail_only_track) and KUID 36646:37002 (DummyRoad) are required
for this item.