In the 1930s, lighter-weight materials allowed for the development of a variety of coach, baggage, and observation cars as railroads ushered in the beginning of the streamlined era. Materials like stainless steel, and aluminum, allowed for passenger cars to have smooth sides, and their lightweight construction proved valuable in reducing travel times on express services. The streamlined observation car was an evolution of the open-ended observation platforms found at the end of long-distance heavyweight consists. Fully enclosed, the car curved to a point, offering a full 180-degree view of the track behind,  with a rear door or window, and space for a drumhead to advertise the service below. The Bachmann 85' Smooth-Side Observation Car features a fully furnished interior with lighting, and will work best on 22" radius curves or greater.