157006A HO Procor 5820 Covered Hopper: UNPX - Procor Mid Black Solid: Single CarPlastic pellets are an often overlooked, but highly important commodity in the manufacturing world. Almost everything you see thats made of plastic was once carried by covered hopper car in pellet form. Rapido is proud to present the Procor 5820 Covered Hopper car. This hopper was built in batches from the late 70s all the way up through the early 90s. Around 1700 examples were built for Procor and Dow Chemical, which were the primary and largest