The Sherwood's Bridge Base & Expansion Kits Set from The N Scale Architect is inspired by the lattice truss designs used by railroads to span everything from small streams to large river valleys. This bridge design is considered by many to be the strongest and most adaptable. Early examples were made from wood, which was later replaced by steel as represented in this model. The kit includes laser-cut plates of textured fiberboard and can be expanded using multiple kits or expansion kits #716-10055 and 10056. Sherwood's Bridge is part of the wide selection of N Scale structures from The N Scale Architect.