I know exactly what you mean about receiving little response to subjects outside the realm of CO, or perhaps Western, narrow-gauge. My own interests- aside from the Sumpter Valley- are in industrial NG and the Maine 2-footers. Unfortunately posts on these subjects are often as not met with crashing silence. (there are a couple of Maine NG fans who post here, I always follow their contributions with great interest). It may be a case of geographic snobbery, or as Mike suggests sometimes folks just don't think they have anything to add. I might add, sir, that your own postings are usually so thoroughly researched and well-stated that I don't feel I can add to them, but I do read and enjoy each one.
Most fans have an area of "specialization" - one of two subjects on which their interest is focused and on which they can speak with authority. But it's disturbing when people limit themselves to these topics to the exclusion of others. They're missing a lot that way. An example-- We always speak of narrow gauge RRs as a thing of the past and to a great extent they are. But did you know (according to the Reed "guide") that there are in excess of fifty narrow-gauge industrial lines still operating in the continental US? It's almost impossible to find information on these, most have always operated and still operate in almost total obscurity. Where are the ranks of historians and photographers? is it because they aren't as sexy as CO lines or western logging RRs?