Nominal size 00
The nominal size 00 (pronounced: nominal size zero zero), also common in Great Britain under the term 4 mm scale and double 0 , is a size for model railways standardized by the British Railway Modeling Standards Bureau (BRMSB) . The standard gauge with a prototype gauge of 1435 mm has a model gauge of 16.5 mm and is colloquially referred to as gauge 00 . The scale is 1:76. This means that 4 mm in the model corresponds to around one foot (304.8 mm) in the original.
The 00 gauge with a model gauge of 16.5 mm has the same model gauge as the H0 gauge used in continental Europe and North America.
Even before the Second World War , there were efforts to develop a nominal size about half as large from the nominal size 0 , which on the one hand was better suited for the construction of home systems and on the other hand made it possible to further reduce manufacturing costs. From these efforts, the nominal size H0 (pronounced: nominal size Ha-Null) developed in continental Europe, which was initially referred to as nominal size 00. The standard gauge with a prototype gauge of 1435 mm has a model gauge of 16.5 mm. Today the scale is uniformly 1:87, after different scales were originally used, e.g. B. 1:90 Trix or 1:82 at Fleischmann , whereby the length of various passenger car models was sometimes significantly reduced. The new nominal size H0 replaced the previously market-dominating role of the nominal size 0 and became the market-dominating nominal size itself.
Nominal size 00 as the historical name of the nominal size H0
The nominal size 00 is also a historical name for the nominal size H0, which is now widespread in continental Europe, North America and Australia. The standard gauge with a prototype gauge of 1435 mm also has a model gauge of 16.5 mm, but today the scale of the nominal size H0 is also 1:87.
The designation of the nominal size 00 as the original designation for the nominal size H0, also common in England under the term 3.5 mm scale , should only be used today in a historical context, as this can lead to confusion.
Difference between 00 and H0
The mix-up of the two nominal sizes 00 and H0 is mainly due to the marketing of the models from English manufacturers under the designation H0 / 00 . Both nominal sizes use tracks of the same gauge, but the structures of the trains and the accessories do not match in scale for the two nominal sizes. In addition to the models in nominal size 00, models in nominal size H0 appear too small.
The British Railway Modeling Standards Bureau (BRMSB) has specified the following model gauges for the nominal size 00 at a scale of 1: 76.2 :
|track||designation||Model gauge||Prototype gauge||comment|
|EM||Standard gauge||18.2 mm||1435 mm (4 feet 8½ inches )||Exception (small series manufacturer)|
|00||Standard gauge||16.5 mm||1435 mm (4 feet 8½ inches)||As a rule (large and small series manufacturers), H0 gauge tracks|
|00-12||Cape Track||12 mm||1067 mm (3½ feet)||H0m track tracks|
|00n3||Narrow gauge||12 mm||914 mm (3 feet)||H0m track tracks|
|00-9||Narrow gauge||9 mm||762 mm (2½ feet)||H0e track|
The EM gauge (EM = eighteen millimeters) is a gauge that is mainly used in Great Britain for model railways on a scale of 1: 76.2 with a gauge of 18.2 millimeters (EM gauge). Sometimes the term 4 mm (4 mm to 1 foot / 4 mm = the 76.2th part of a foot) is also used for EM.
While the 16.5 millimeter gauge taken from the nominal size H0 leads to a prototype gauge of 1257 millimeters, the EM gauge reproduces the standard gauge a little more correctly (18.2 mm × 76.2 = 1387 mm). However, it requires its own track system and rolling stock designed for this track system.
The EM gauge was established during the Second World War by the British Model Railways Standards Bureau (BRMSB) with a gauge of 18 mm (originally referred to as EM gauge). It was later widened to 18.2 mm (originally referred to as the EEM track). After the 18.2 mm gauge was generally accepted as the only standard, the EM gauge for the 18.2 mm gauge has become established.
In contrast to the 00 gauge, which runs at a scale of 1:76 on the H0 gauge tracks available in many places with a gauge of 16.5 mm and thus reproduces the standard gauge clearly too narrow, the EM rails give the standard gauge a little more true to scale again, but have to be built largely by yourself and are therefore rare today.
The S4 or P4 gauge (“Scalefour” or “Protofour”) comes even closer to the original with a rail spacing of 18.83 millimeters.
The umbrella organizations for these gauges are the EM Gauge Society and Scalefour Society , which also maintain their own websites.
In Great Britain, the letter O is sometimes used instead of the number 0 to denote the nominal size or the gauge .
For the narrow-gauge railways, the designation is inconsistent in England. In this article, the spelling is consistently used as follows: 00 for the nominal size and model gauge separated by a hyphen. Example: 00-12 .
- The-difference-between-HO-OO-Scale-Gauge-Basics- . In: eBay . ( ebay.com [accessed September 23, 2018]).
- Brian Considine: 66's - comparison between HO & OO. In: flickr.com. Retrieved on September 23, 2018 (comparison of two Class 66 models , in front the HGK locomotive in nominal size H0, in the back the GB Railfreight locomotive in nominal size 00).
- Brian Considine: 66's - comparison between HO & OO. In: flickr.com. Retrieved on September 23, 2018 (comparison of two Class 66 models , on the left the HGK locomotive in nominal size H0, on the right the GB Railfreight locomotive in nominal size 00.).