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[quote user="timz"]When Type E superheaters first appeared in the US, the flues were usually 3.5 inches diameter; in later years lots of engines had 3.75-inch or 4-inch flues. So fewer flues, and less heating surface, but maybe more gas area, which I assume was the point.[/quote] Timz and fellows,thank you for your explanation, which makes sense to me, now.Interestingly, quite a number of later built engines, as your example of the C&O engines shows it, were preferably built with Type A super-heaters.I think, all the '44 built UP engines, the very last order of Challengers, FEF's and BB, used this type.They all, indeed, lost heating surface. E.g BB: From the first batch to the second one, (Type E 2466sq ft. / Type A 2043sq ft.), the later ones had also larger, but fewer tubes. The total evap. heating surface sunk from 5889 to 5755sq ft.Best Regardslars
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