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I'm a bit late on the thread but here we go Gauge as in 00 or HO refers to a scale/gauge combination. 0 is 1:43.5 in the UK and I believe 1:45 over there S is a true imperial scale at 3/4" to the foot - I have a couple of friends who model in what they call the perfect scale here in the UK. I'm not sure of the track gauge. 00 The British *** scale of 4mm to the foot running on 16.5mm gauge because our locos were too small for the motors. P4 Protofour) which is the same 4mm to the foot 1:76 scale running on 18.83 exact scale is for the real engineers, I model in EM 18.2mm gauge which is as close as damnit to swearing scale. TT is pretty much defunct in the UK and was 3mm to the foot - commercial TT used 12mm, exact scale is 14.2mm. The ratio is 1:100 000 was the first name for what became N which again has different ratios depending on where you live. G is for Gross and was developed in Germany by Lehmann and is pretty much accepted as 1:22.5 on 45mm tracck for European Narrow Gauge. An interesting NG scale is SM32 which is 16mm to the foot to give exact 2 Foot on (O gauge) 32mm track and the list goes on and on... All the best from the other side of the pond.
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