N&W locomotive fuel coal

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Thanks to all who answered my question regarding N&W fuel coal BTU content. And thanks to Harry for the ash content.  I had been reading a couple of Union Pacific books on the Challenges and the Big Boys. Several notations in the books caught my eye. The first was that both locomotives were designed to burn 11,800 BTU coal. Second, that primarily,  the Challenges suffered from sever cinder cutting on the tubes and flues, and the front end.  I never recall cinder cutting being a problem with the N&W A's or Y6's.   The UP used both Hanna and Rock Springs coal as locomotive fuel. The Hanna coal was said to contain a high ash content and the Rock Spring coal burned too fast. (Burning too fast seems to me to be a strange problem).  Both the Big Boys and the Challenges had drafting problems when working at any rate other than wide open.  UP experimented with single stacks on both class of locomotives but came back to the twin stack in both cases. There are a number of details on UP's finest in the material, all of which make the N&W A look even better. Harold Davenport    
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