concentration
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Sigma KEE - StandardGauge
standard gauge
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StandardGauge is the attribute of Railways having the standardized track width that is used in North America and most Western European countries. The standard is typically a distance of 4 ft., 8-1/2 inches (1.44 meters). There is some variation within which usage is compatible, e.g., 1.35 meters. Standard gauge originated in England and was mandated by the U.S. Federal government for the U.S. Transcontinental Railroad. It is also used in Canada, Great Britain, and most of Western Europe (but not in Ireland, or Spain and Portugal.
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Instances | abstract | Properties or qualities as distinguished from any particular embodiment of the properties/qualities in a physical medium. Instances of Abstract can be said to exist in the same sense as mathematical objects such as sets and relations, but they cannot exist at a particular place and time without some physical encoding or embodiment. |
| attribute | Qualities which we cannot or choose not to reify into subclasses of. |
| entity | The universal class of individuals. This is the root node of the ontology. |
| internal attribute | Any Attribute of an Entity that is an internal property of the Entity, e.g. its shape, its color, its fragility, etc. |
| track gauge | TrackGauge is the collection of attributes that characterize sections of railways, according to the set distances between the two tracks of the Railway. Precisely, the measurement of track gauge is the distance between the inner vertical surfaces of the heads of the rails. Track gauges include broad, dual, standard, and narrow gauges. |
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