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Over-fire air jets ?
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My understanding is that they weren't intended to be used when the locomotive was producing power; the normal draft was expected to do the job. They were intended to be used in yards and engine terminals to reduce smoke output when the locomotive was sitting still or operating with minimal throttle. The air introduced over the firebed was intended to mix with the products of combustion to burn the carbon more thoroughly, thus reducing the amount of unburned carbon going through the flues. <br /> <br />They worked pretty well, too. <br /> <br />Old Timer
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