I just don't understand why this question is being asked when the answer is so
simple.
"Gauge" is the distance between the rails (approximately 7/8", or more
precisely, .883").
"Scale" is the proportion of the models (1:64 in our case).
In S and O, the term "scale," when juxtaposed with the terms
"hirail" or "tinplate," has come to connote NMRA standards-comforming. The
real source of confusion in S is whether the track and wheels follow the
NASG/NMRA standards for S scale or not. If they do, then all such equipment is
interoperable. That is, anyone's standards-conforming equipment can run on
anyone else's standards-conforming layout.
Equipment that does not follow the NASG/NMRA standards is generally classed as
"hirail" or "AF-compatible." There is no other test. There are so many
different sets of measurements used by different S hirail wheelset
manufacturers that the only way hirail equipment can run reliably is on
trackage that does not rely on guard rails to keep flanges from picking frog
points. If you don't believe this, ask Don Thompson why SHS has resorted to
movable-point frogs and no guard rails.
Dick Karnes
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