My in-laws run an estate sale business. As part of a recent sale they came across a huge model train collection. Much of it was N-Scale. Being an avid N-Scaler they contacted me to answer a few questions. They also asked me about some trains they were told were M-Scale. I said I never heard of that scale. Could anyone verify the existence of M-Scale? Thanks in advance.
However there is an actual model train scale / gauge called “Em” scale (not sure if it’s pronounced “E-M scale” or “M scale”??) that’s used in the United Kingdom.
HO scale works out to 3.5mm = I foot, but in Britain they use “OO” scale, which are trains scaled at 4mm = 1 foot, but running on HO track…so the track gauge works out to be much to narrow.
Em uses the same OO linear scale of 4mm = I foot, but widens the track gauge from HO’s 16.5mm to 18.2mm which is closer to being correct (18.83mm gauge - “ProtoFour” - would be exactly right for 4mm.)
I remember something about an M-scale or M-gauge back from the early 1980s. It seems like it stood for Magnus. I remember some advertisements for it in the magazines, and saw some for real at Caboose Hobbies in Denver. Thinking back at the size, I would guess that it somehow morphed into G-gauge.
TT is 1:120 scale. The gauge is 12 mm. I dabbled in it for a while in the 70’s. EM scale or EM gauge is 4 mm to 1 foot. The scale ratio is 1:76. EM gauge was founded in the 50’s and used 18 mm track. It eventually evolved into 18.2 mm track and for a while was called EEM gauge. Even at that was still 1.9 inches too narrow so a P4 scale standard (18.83 mm) was developed. P4 or Protofour is also 4 mm to 1 foot. The scale ratio is 1:76.2. The gauge is 18.83 mm (0.741 in).
AFAIK, M scale is 1/13.5 and used to be included in NMRA standards. I am into model railroading since 1963, and I have not heard of a manufacturer in that scale.