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Most of the coal trains which do not have rotary dump cars will have the air dump hoppers with two air lines. One is the regular air brake line and the other is the air line used to operate the air opening hopper gate on the bottom of the cars. This air dump line is usually disconnected in one or two locations when the train is moving on the mainline, but is connected when the train arrives at the unloading power plant. Most of these cars have a metal striking plate on the side which is pushed to open the hopper gates when the car arrives over the dump pit.
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