Hi Guys,
This is not supplanting your previous posts, but has some further items of interest.
Here are two rather detailed, exhaustive resources, as well as the most common scales:
Model Railroad Scale ListModel Railroad Scale ConverterTypical model railroad scales are (largest to smallest):
1:12 Large Scale
1:13.7 7/8 inch scale
**** all of these are considered G scale ****
1:20.3 G, Three-Foot Gauge on Gauge 1 Track
1:22.5 LGB and Bachman
1:24 Half scale
1:29 Aristo-Craft, USA Trains, standard gauge on #1 gauge
1:32 I scale
****all of above are considered G scale ****
1:48 O scale (Hmmmm...goes well with Tamiya's new line of armor...
1:64 S scale
[1:76 OO scale]
1:87.1 HO scale (Roco's MiniTanks, Trident's line, etc.)
1:120 TT scale
1:160 N scale
1:220 Z scale
--source, CSG, Computer Support Group, Inc. and CSGNetwork.Com
Much more:
Model Railroad Scale DataTrivia, in the US, O scale is 1/48 but in England it is 1/43; double that and you get 1/87, = HO (Half [of] O scale). Also, some of these are the closest fractional conversions of milimeter scales, i.e., 4mm/foot.
The beloved 027 is Lionel's creation for their track. It is basically O scale but the curves are set to 27"r to fit on the common 4' X 8' plywood, hence O (scale) 27 (inch radius curves).
Also, I recently found a list of G scale. G means "Garden" (outdoor capable) and includes a mix-N-match ranging from about 1/18 through I scale (1/32). This is because they are all designed to operate on a certain commercial piece of track with a common gauge (distance between the rails). So the larger the scale as a ratio of the track gauge means the bigger scales become narrow gauge trains in their particular scale. In railroad parlance, scale and gauge mean different things.