Well, I may not be a railroad employee, but I know there's something wrong with that picture. Not good.
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No kidding. Looks like it went into emergency.
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There is nothing wrong here. It is either shut down and the air is falling or has just been started and the air is rising. If it were any kind of emergency situation the brake cylinder pressure would be high, the main reservoir would still be high and the equalising reservoir would probably be at zero.
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