I don't have room for any downloading right now, but I do appreciate your doing that for folks.
G gauge doesn't roll of the tounge well is my #1 theory why we "stray" to begin with. Gauge or scale being the subject becomes apparent apparent quickly anyhow. G scale IS the commonly used term to refer to both scale or gauge, unless the subject matter's comparison's is mixed, including both scale and gauge as specific referencable material. Then you need the exactness.
I.e., The use of GS to describe gauge has never confused me that I recall.... it isnt Wide,1g,2g, St; it's G .
At some point a real need for distinction is necessary, I just don't think it exists yet in "G"
I also reserve the right to translate outside of propriety branding terms, even though there was a first. Thus we'th might'th experience'th the natural evolution of language Horatio. 😉
It must be 1g that was often close "enough" to "G" in gauge between outer rails. Not an exact match, one or the other may be too tight of a fit depending on flange and axle stop tolerence/slop.
....I was just peeked at Wikipedia.. G is a mess there.
The whole railroad section is a mess really. It seems like it has been "scholarized" and is not written by modelers or railfan historians anymore, but by folks with a passing interest who studied for a month to write a term paper in a vernacular they are more comfortble with, though IMO this distracts from real learning. I.e. It nearly becomes a list of facts without enough relevant context. The whole site seems to have gone in that direction. They have "cleaned" till the paint fell off imho.