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Alastair is correct the really confusing thing is the mix of model gauge versus protoype gauge, I've re stated some of his to make the differences clearer.

N6.5 - N scale metre gauge using Z track.

OO9 - OO on 9mm track
HOe - HO on 9mm track - 750mm gauge prototypes.
OOn3 - OO on 3 foot gauge (12mm track )
HOm - HO on metre gauge - 12mm track,

O6.5 - O scale on 6.5 mm track, 10 1/4inch or 12 inch gauge prototypes ( models of miniature railways)
O9 - O scale on 9 mm track, 15 inch gauge prototypes.
O2 or O14 - O scale on 2ft or 14 mm track, (1ft 11 1/2 inch gauge prototypes).
On30 - US 1/48th O scale on 30 inch gauge (16.5mm OO/HO track)
O16.5 - British O scale on 16.5mm OO/HO track - (1/43 scale representing 2ft 3inch gauge).
On3 - US 1/48th O scale on 3 foot gauge (19mm track)

Gn15 - g scale on 16.5 mm track, 15 inch gauge prototypes.
SM32 - Sixteen Millimetre scale on 32 mm track.
G - 1/26, 1/24, 1/22or 1/20.3 on 45mm track
 
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