One thing that I think creates confusion (I wouldn't have known without reading other folks being corrected) is that "3 rail scale" isn't for folks with 3 rail models that are produced to scale size. I realize that is an industry-wide accepted term for scale models with scale couplers and sometimes scale wheel flanges....BUT I think many are still confused by it just the same. I know all the different terms and such took me a while to understand and get used to after switching from HO to O. (Hi-rail, 3 rail scale, conventional, semi scale/027, etc.) Sometimes we each get so wrapped up in the hobby and what we know, that we forget that others may not have the same knowledge we assume that they do. Just food for thought.