City viaducts were constructed in many American cities in the early twentieth century where elevated track was needed by railroads or mass transit systems in congested city areas. Many of the prototype viaducts are still in use today making these HO kits suitable for turn-of-the-century through modern-era layouts. City Viaduct kits follow prototype construction by incorporating scale-size moldings of the lattice work, angle irons, cross beams, lateral bracing, X bracing and many rows of rivet heads. All kits fit HO track.