Detail your O Scale right-of-way with this assortment of authentic tunnel portals. They're based on common railroad designs used on roads large and small in both the steam- and diesel eras. Each is an accurately scaled replica, cast in high density Hydrocal(R). Instructions for installation are also provided. For more realism, the castings are easily stained or painted with Woodland Scenics Earth Color Liquid Pigments, sold separately. Sold individually.