Rapido Trains 172004A HO Scale Procor 3000cuft Aluminum Hopper "Handrail & Worldmark" UNPX Car #4 Auto Reverser - DCC where it has been restored

where it has been restored to its as-built appearance

The development of the hopper car went along with the development of automated handling of such commodities

But even with these challenges

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Rapido Trains 172004A HO Scale Procor 3000cuft Aluminum Hopper "Handrail & Worldmark" UNPX Car #4 Auto Reverser - DCC where it has been restoredRapido Trains 72004A HO Scale Procor 3000 cuft Aluminum Hopper "Handrail & Worldmark" UNPX Car #4 In the early 1980s sodium chlorate began to replace chlorine as a bleaching agent in the paper making process. Historically, sodium chlorate had been transported in solution form in tank cars. With significant increase in demand, a more efficient delivery method was needed. Transportation in crystal form by covered hopper car was a natural solution.