I am following my Intuition, Why box myself into doing one railway? Because doing so is interesting to me? Why one scale? Well, whatever gave you that impression? I have active Modelling projects in HO and N along with American Flyer (currently on display, but someday there will at least be a christmas layout) and some Bachmann G stuff for a Garden Railroad in boxes at Mom's until I have a backyard to put them in. I did at one point sell off almost all my N-scale and that was a mistake. I was trying to de-clutter and thought I was done since HO was where my heart and years worth of purchasing was. But ironically, switching to HO has reduced the scope of my N-scale desires since I no longer feel compelled to replace what I had in HO. My N-scale purchases are opportunistic and targeted. My goal is to have an operable and fun N-scale layout based almost entirely on donated and low-cost materials. So far, I'm doing pretty well. If I were willing to switch to transition era, I'd have even more stock to pick from.