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Normal firing builds up a layer of material on the inside of the flue's that insulates the hot gases from heating the water correctly. When the engine is worked fairly hard, sand is fed into the firebox door opening and it is drafted up into the flues cleaning out everything that is inside on the walls of the flues. This is really dirty stuff and it goes up and out the stack if the engine is pulling hard. That is why the diesel used the dynamics to provide a load on the engine when the flues were sanded. It was done as a matter of course in normal railroading. <br /> <br />
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