The vast majority of railroading in the world uses what is typically referred to as standard-gauge*. This is 4' 8-1/2", or 1435mm, between the rail heads. This section covers how we model this in S-scale.
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*Unfortunately, in model railroading's history there was a format called "Standard Gauge" introduced by Lionel in 1906. You can read more about it on Wikipedia. When we use the commonly-referred-to term "standard-gauge", we use it to differentiate between 4' 8-1/2" railhead spacing and that of the narrow-gauges (Sn2, Sn3, and Sn42). We will always use the hyphen between the words "standard" and "gauge", to make it clear that we are not referring to the Lionel name (there is absolutely nothing on this web site that has anything to do with Lionel's "Standard Gauge", except for this paragraph).
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