


InterMountain Procor Pressure Flow Hopper (48901-22) | Canadian National CN #374555 | HO Scale
Marsoni
M251S
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Friday, May 29
InterMountain Procor Pressure Flow Hopper (48901-22) | Canadian National CN #374555 | HO ScalePressure flow hopper cars, commonly known as "Flexi Flo" hoppers, revolutionized the transportation of dry bulk commodities by rail. Developed in the 1960s, these cars utilized pressure differential technology to efficiently unload materials such as cement and other dry bulk goods. In 1964, the American Car & Foundry (ACF) introduced the PD3500, a 3,500 cubic foot pressure differential covered hopper, branded as "Flexi Flo." This design featured a
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