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OO gauge | |
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Scale | 4 mm to 1 ft |
Scale ratio | 1:76.2 |
Model gauge | 16.5 mm (0.65 in) |
Prototype gauge | Standard gauge |
OO gauge or OO scale (also, 00 gauge and 00 scale) is the most popular standard gauge model railway standard in the United Kingdom,[1] outside of which it is virtually unknown. OO gauge is one of several 4 mm-scale standards (4 mm to 1 ft (304.8 mm), or 1:76.2), and the only one to be marketed by major manufacturers. The OO track gauge of 16.5 mm (0.65 in) (same as the 1:87 HO scale) corresponds to prototypical gauge of 4 ft 1+1⁄2 in, rather than 4 ft 8+1⁄2 in standard gauge. However, since the 1960s, other gauges in the same scale have arisen—18.2 mm (EM) and 18.83 mm (Scalefour)—to reflect the desire of some modellers for greater scale accuracy.