0 Gauge

OO gauge or 00 gauge model railways are the most popular standard in the United Kingdom. It is one of several 4 mm scale standards (4 mm to the foot (304.8 mm), or 1:76.2) in use, and the only one served by mass market manufacturers. 00 uses 16. more...

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5 mm gauge track, which is inaccurate for 4 mm scale.

History

Double-0 scale model railways were launched by Bing in 1921 as 'The Table Railway', running on 16.5 mm track and scaled at 4 mm to the foot. In 1922, the first models of British prototypes appeared. Initially all locomotives were powered by clockwork, but the first electric power appeared in autumn 1923.

OO scale uses the same track gauge as H0 gauge (3.5 mm to the foot, 1:87). However, the large propulsion mechanisms could not fit into the small British prototypes, so the scale was enlarged to 4 mm to the foot without altering the gauge. This means that the scale gauge represents 4'1½", seven inches narrower than the prototype 4'8½". It is also used to represent the 5' 3" Irish gauge, where it is a scale 13½ inches too narrow. These noticeable differences are aggravated by the over-scale rail section, over-scale wheel width and very deep wheel flange. These departures from scale require much larger clearances on pointwork and are particularly noticeable when looking down the track.

In 1932 the Bing company collapsed, but the Table Railway continued to be manufactured by the new Trix company. Trix decided to use the new H0 standard, being approximately half of 0 gauge (1:48 scale).

In 1938, the Meccano Company launched a new range of 00 models under the trade name of Hornby Dublo, and 00 gauge has remained the UK's most popular ever since.

Read more at Wikipedia.org