This is a can of worms for sure. O gauge is 1:43.5 in England, 1:48 here. O gauge track is 1.25" in gauge which is the equivalent of 1:45.2 scale. True 1:48 would be 1.177". The top end engines are more or less in 1:48 scale for length and height, but the track gauge and profile, couplers, wheel flanges, configuration of the pilot and trailing truck, distance from engine to tender are not- not to mention the center third rail. Everyone has their own line in the sand. Over in tinplate, we just embrace non-scale.
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