American OO scale
American OO scale is a model railroad standard that has a scale of 4mm:foot (1:76) and utilises 19mm gauge track. The standard is different to British 00 gauge (which is popular in Great Britain), as it utilises 19mm gauge track rather than 16.5mm gauge track (H0 gauge). It also differs from British 4mm finescale standards (EM gauge and P4) which have gauges of 18.2 mm and 18.83 mm respectively.
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