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M Scale might be already taken:"Recently, NMRA proposed some additional scales as standards. The additions to the NMRA list are 1-1/2 inch Scale [1:8], M Scale [1:13.5], F Scale [1:20.3], and A Scale [1:29]. They represent the latest trends in Large Scale modeling practice but sadly, they were never adopted as standards"https://www.ross-crain.com/model-trains/scale-gauge-encyclpedia-model-trains.htm
Well that just figures! But looking over Crain's list, they do have 1:300 scale being "ZZ" scale so I guess I need to adjust my preferred nomenclature. This would also explain why they make the long-sleeper flex track since there would appear to be a small (pardon the pun) market in Japan for ZZ.
