Atlas 835 HO Scale Code 100 Track 18" Radius 1/3 Curve 4 Pack The highly successful PS-2 covered hopper was designed by Pullman Standard in the 1940s. This virtually all-welded 2 bay hopper had a 2003 cubic foot capacity and was well-suited for a variety of transportable bulk commodities such as sugar, wheat and oat flour and calcium carbide. However by 1952, the demand for a larger covered hopper was quite evident. Pullman Standard quickly responded with a new 3 bay car. This new hopper was just what the railroads and lessees wanted and it soon superseded the 2 bay car in production. FEATURES INCLUDE: Roller bearing trucks with rotating bearing caps Separately applied ladders, brake wheel & brake line detail True scale dimensions with accurate details Weighted, detailed underframes Metal couplers and sprung die-cast trucks Accurate painting and lettering 3-rail trucks pre-drilled for Adjust-A-Coupler™ System (sold separately) 2-rail cars feature scale wheels and body-mounted scale couplers NEW DESIGN Kadee® compatible couplers (2-Rail)