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2. OO gauge - Wikipedia

   en.wikipedia.org/wiki/OO_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.

3. List of rail transport modelling scale standards - Wikipedia

   en.wikipedia.org/wiki/List_of_rail_transport...

   This gauge is represented by the EM Society (in full, Eighteen Millimetre Society). 00 track (16.5 mm) is the wrong gauge for 1:76 scale, but use of an 18.2 mm (0.717 in) gauge track is accepted as the most popular compromise towards scale dimensions without having to make significant modifications to ready-to-run models. Has a track gauge ...

4. Hornby Railways - Wikipedia

   en.wikipedia.org/wiki/Hornby_Railways

   Both OO and HO use the same track gauge, but their scales are different. Beginning as literally "half O gauge", the HO models of continental prototypes at 3.5 mm/foot (1:87) scale were workable but Hornby chose to slightly increase the scale to 4 mm/foot for the smaller British prototypes, to provide more internal space for a motor.

5. Rail transport modelling scales - Wikipedia

   en.wikipedia.org/.../Rail_transport_modelling_scales

   This scale is today the most popular modelling scale in the UK, although it once had some following in the US (on 19 mm / 0.748 in gauge track) before World War II. 00 or "Double-Oh", together with EM gauge and P4 standards are all to 4 mm scale as the scale is the same, but the track standards are incompatible. 00 uses the same track as HO (16 ...

6. Rail transport modelling - Wikipedia

   en.wikipedia.org/wiki/Rail_transport_modelling

   British OO standards operate on track significantly too narrow. The 4 mm/1 foot scale on a 16.5 mm (0.65 in) gauge corresponds to a track gauge of 4 ft 1 + 1 ⁄ 2 in (1,257 mm), 7 inches or 178 millimetres (undersized). 16.5 mm (0.65 in) gauge corresponds to 4 ft 8 + 1 ⁄ 2 in (1,435 mm) standard gauge in H0 (half-0) 3.5 mm/1 foot or 1:87.1 ...

7. 4 mm scale - Wikipedia

   en.wikipedia.org/wiki/4_mm_scale

   OO gauge uses 4 mm scale with 16.5 mm gauge track, [3] [4] which is inaccurately narrow since it is correct for HO scale (1:87.1). It is the most popular standard in the UK for 4 mm scale trains [5] and is produced by the two main manufacturers in the UK.