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1:22.5 ratio running on 45mm gauge track. Any other ratio running on the same gauge track could, quite reasonably, be referred to as "Large Scale". This is what most of us do here in Australia, in sturdy defiance of many colleagues who run models on track of wider gauges ( 2&1/2inches, 3&1/2 inches, 5 inches & 7&1/4 inches. all of which are common in this country) to varying ratios, most of which are as inaccurate as 1:29 on 45mm gauge track! The ratio 1:24 ("half inch scale") is reasonably correct for 2&1/2 gauge, which is the original Number 3 "Gauge" dating back to the early 1900s. This, basically, is the "scale" with which LGB started when they set about developing models to run on 45mm gauge track, representing metre gauge (and similar) prototypes. The arithmatic involved led to their adoption of a ratio of 1:22.5. One forum member related this, incorrectly, to Number 2 Gauge, which is 2 inches and is now, to all intents, extinct. Work the arithmatic backwards and you will see the relation between the "scales" so widely used for 1435mm "Standard" Gauge protoptypes and 900mm "Metre" Gauge prototypes on 2&1/2 inch and 45mm Gauges respectively. Again, turning to the dichotomy between 1:32 & 1:29 ratios, if you work the arithmatic back very carefully, you will see that neither is strictly accurate, despite commonly held dogma! As I model American prototype Standard Gauge, I prefer the latter, because it's more readily available in Australia! Having made that decision, I must stick with it. Conversely, we tend to refer to live steam models running on 45mm and smaller gauges as "Small Scale live steam"! Neil <br /> <br />,
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