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Coal (open hopper) car air hoses
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[quote]QUOTE: <i>Originally posted by wayne</i> <br /><br />Thanks again for all the good info -very helpful an interesting. Wayne <br />[/quote] <br /> <br />The DMI cars did have only one brake pipe hose. I was told they mounted them above the coupler because piles of ore pellets in the gage at the mines and docks caused premature hose wear and hose partings. (That was certainly the cae at the PRR Whiskey Island ore docks where I worked, and where we occasionally borrowed a train of DMI cars). I just know they were a pain to couple in the trainyard if you had a unit train, and impossible if you ever had them kicked into a mixed freight. <br /> <br />There are pneumatic covered hoppers, mostly for products like plastic pellets. The slope sheets taper down to a round tube at the bottom. You attach compressed air to one end and the pellets are blown out the other end, usually into another hose that leads to a storage silo. You don't use locomotve air though, the cars are spotted at an industry or transloading site and are usually unloaded one or two at a time. <br /> <br />Covered hoppers that carry grain are gravity unloaded. The slope sheets taper down to a flat, horizontal door. A shaft with a pinion gear is attached to the door. The door frame has a gear rack. You put a long bar or a power wrench into a socket on the end of the shaft and crank the door open. Typically you would use a special electric wrench rather than a drill. You need a couple horsepower and a low starting torque so that you don't damage the rack and pinion mechanism. <br /> <br />
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