While I agree with the concept of author's making attempts to make things more clear would be great (many good points on useless thread titles are described above), I hope people don't start typing the whole forum section name as an opening for their thread title with every post!
Having half the posts start with an intro of "High-Rail, O27 and Traditional 3-Rail O Gauge" would swing us into the other direction where there is too much clutter that would now be attached to each thread title (all IMHO).
I do admit that back years ago when the forum got sub-divided into so many different categories, I stopped looking in each forum as a full list of topics to view. I then migrated to primarily only scanning down the "recent posts" section, and I figure anything interesting enough will appear there at some point. (though if I have something I want to ask about or try to look up, I will then search or do a focused viewing before asking something that might be a duplicate). I probably miss some threads this way, but it got to be too much time (for me) to go through all the different sub-sections.
-Dave