2 gauge
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2 gauge (also called II gauge) is a model railway gauge of 64 mm, standardised in 1909 but since fallen into disuse. The gauge was introduced by Märklin at the Leipzig toy fair in 1891. 2 gauge is equivalent to 1:22,5 scale.
The European G gauge trains are built to the same scale, but with a rail gauge of 45mm (the same as 1 gauge), which is the equivalent of 1000 mm gauge in modern railroads. As a result, the scale-gauge combination is sometimes called IIm in European literature.
