The NMRA had nothing to do with the success/failure of that. They simply do not have any influence on what happens in large scale. That’s actually a good thing, because the “naming scheme” they put forth at one time had an individual letter with complete–and unique–set of standards for each of the individual scales. The standards that are in place now for large scale were developed by large scalers (some of us outside of the NMRA), and designed with one single goal in mind; consistent wheel and track standards across the scale spectrum. We pretty much succeeded, but still, the NMRA’s influence on large scale is so small that the manufacturers are slow to adapt, and many who appear to do so do only by coincidence.
The LS## scheme that was put forth in the late 90s didn’t go anywhere because it lacked any kind of manufacturer support. At that time, it seems they didn’t want to segment their market. Aristo, Hartland, Piko, and a few others use the “G45” circle emblem we see now. Some put the scale in the circle, some do not. (Piko used to, but that seemed to stop about the same time it was pointed out that their models of standard gauge locos were not 1:22.5).
Ryan Equipment Co. did at one point in the early days, but it just never caught on. The problem was locomotives. LGB was the 800 pound gorilla in the room, and you can’t re-gauge their motor blocks to make them narrower. With no fodder for proper motive power, the idea just withered and died.
Later,
K