HO PROCOR 5720 Covered Hopper DCLX DOW ChemicalDetails: The Rapido Trains HO Scale Procor 5820 Covered Hopper is based on cars used for hauling plastic pellets used in manufacturing. Prototypes were built in batches from the late 1970s all the way up through the early 1990s. Around 1700 examples were built for Procor and Dow Chemical, which were the primary and largest owners. Essex Hybrid would later receive a handful of cars for seed service. The Rapido Trains model features roadname specific