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I used to think fans (fan shrouds) come in two types: round-top and flat-top. Flat-top fans had a higher rim or collar and may or may not have had a flat central "hub" which was about half the diameter of the fan and may or may not have extended slightly above the rim. Round-top fans had little or no rim or collar, a slightly concave slope, and a smaller central rounded (convex) nub. More recently I have come across the following terms to describe fan tops: button-top cap-top disk-top open-top pan-top in addition to the generic: flat-top round-top I am completely confused. I know that the original manufacturing was not completely consistant, that fans types were frequently swapped during routine maintenance, and that wholesale replacement was common during rebuilds. Can anyone give me guidance about which is which. What dates they were used or on which models. Or where I can get more info. Searches of Trains.com forums has yielded zip. Thanks.
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