Straighten me out then, fellas, as I am positive you will not hesitate to do.
If we held strictly to that precept, on this page, 88, as an example, then looking back at the post showing a diner, every post reply would have to be featuring a diner. How would we go anywhere else, then? The post showing Gilly's Switch Tower, and Arnold's featuring signs, and mine showing more locomotives would be offenders of the sacred rule, and would merit removal. Well, if you say so, I will do so immediately that I hear from you.
Apparently, then, I mistakenly misunderstood that the "link" among the "chain" was the enjoyment of sharing photos, along the line, which reminded each of us of a particular feature among our own creative efforts in our hobby. Also, we are not all able to stay glued to this thread, nor the Forum, every minute of the day, nor over a couple days' time period, so we might easily come across a posting that interested us, once we were aboard again, quite beyond when it appeared along the chain; hence, we would, of necessity, be posting a photo that was at a precise spot along the line, BUT in keeping the the spirit of the thread - sharing related details, when we were able to post. No?
FrankM