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Sigma KEE - TrackGauge
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TrackGauge
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.
Relationships      
Parents 内部属性 Any Attribute of an Entity that is an internal property of the Entity, e.g. its shape, its color, its fragility, etc.
InstancesBroadGaugeBroadGauge is the attribute of any Railway that has a TrackGauge wider than StandardGauge.
 DualGaugeDualGauge is the attribute of any Railway that has three parallel rails, thus allowing two different gauges of rolling stock to travel over it.
 NarrowGaugeNarrowGauge is the attribute of any Railway that has a TrackGauge narrower than StandardGauge. There are several common track widths among NarrowGauge railways.
 StandardGaugeStandardGauge 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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