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Quote: "It is not the ability of coal to burn "More or less" powerful but the overall design of the boiler to feed the cylinders."I meant it in a way of efficienty, that certain firebox design's are nesseccary for certain kinds of coal and can improve overall efficiency dramatically. "The firebox was one of the not good designed parts of BB", to literally repeat Kratville about what he write in his book. Built as a compromise, but could deliver enough power if you get used to it. However, ' never saw any of the Western Roads ever used those deep "Super Power" boxes. Burning Oil was another alternative for them, also. "...4-4-4-4 Duplex from the PRR. Engineers swore they were slippery"Because the engineers did not know how to handle this new kind of machine. "Take the Triplex..."On hot summer, the cap of a Triplex was the coolest place ;-) Regards lars
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