L gauge

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L gauge is the unofficial term for toy trains built from LEGO®.

There are many different sizes within the nomenclature. These are typically defined by the width of the trains in "studs" (1 stud ~ 8 mm). Typical sizes using the standard track and minifigures range from 6 studs wide (the size of official LEGO sets) to 10 studs wide. Since real-life trains vary in size by country, the variance in scale ratio is even larger. Again using the standard track and minifigures, scales from 1/38 (10-wide American-prototype or 8-wide British-prototype) to 1/70 (6-wide Russian-prototype) have been observed.

L gauge trains are becoming increasingly popular among middle-age hobbyists who grew up with the building toy as a child, and are frustrated with traditional model trains such as are found in HO scale.