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in 1891 by Märklin.

See also List of rail transport modelling scales.

USA classification

Z Gauge [1:220]

N Gauge [1:160]

HO Gauge [1:87]

S Gauge [1:64]

O Gauge [1:43 to 1:48, varies]

G Gauge [1:20]

Märklin measured the gauge as the distance between the centers of the two outer rails, rather than the distance between the outer rails themselves. Lionel's

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