Editing 4 mm scale (section)

{{Short description|Model railway scale}}
{{more citations needed|article|date=April 2022}}
{{Infobox model rail scale
| name = 4 mm scale
| image_filename =OO Scale BR 25054.JPG
| image_caption =4 mm scale model of a [[British Rail Class 25]] shown with a [[British five pence coin|18mm coin]] for size.
| scale = 4&nbsp;mm to {{cvt|1|ft|mm|0}}
| standard =
| ratio =1:76.2
| gauge =
| prototype_gauge =
}}'''4&nbsp;mm scale''' is the most popular<ref>{{Cite web |title=OO - World Of Railways |url=https://www.world-of-railways.co.uk/Model-Railways/OO |access-date=2022-03-31 |website=www.world-of-railways.co.uk}}</ref> [[Rail transport modelling scales|model railway scale]] used in the [[United Kingdom]]. The term refers to the use of 4 millimeters on the model equating to a distance of 1 foot (305&nbsp;mm) on the [[Prototype#Scale modeling|prototype]] (1:76.2). It is also used for [[Model military vehicle|military modelling]].

For historical reasons, a number of different standards are employed.<ref>{{Cite web |date=2019-01-16 |title=Model Railway Scales and gauges explained |url=https://www.world-of-railways.co.uk/techniques/model-railway-scales-and-gauges-explained/ |access-date=2022-03-31 |website=World Of Railways}}</ref>