Retaining walls are a critical part of many prototype right-of-ways. Designed to secure other construction and protect the track, they can be found along many railroads and are frequently constructed from a variety of materials. These walls are based on common styles which could be found alongside steam- or diesel-era lines. Each is a one-piece Hydrocal(R) casting that's easy to assemble and finish. The castings can be reshaped, cut or shortened to create a variety of prototype designs, and make a great companion to Woodland Scenics Tunnel Portals, sold separately.