A “de facto” standard is used by some companies making wooden toy trains that run on wooden tracks. This is usually referred to as “Brio” or “Thomas” compatible in reference to two major companies. The term “Vario System” introduced by the company Eichhorn, refers to a variant of the connecting system used by some modern wooden track producers. The tracks don’t use rails as such but rather grooves set apart a certain distance. The same “gauge” is used by the “Lionel Great American Adventure series” produced by Learning Curve, the Plarail system from Tomy and Trackmaster. Although the rolling stock of each system may be used to some extant on the tracks of other systems the compatibility beyond simple straight track and large radius curves may be rather limited.
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