run on track (gauge 1), and radio control is common. Locomotives in this scale are generally large and "chunky", and can range from the tiny 0-4-0 seen on Welsh slate quarry lines all the way up to the very largest found in the UK, such as the ex-ACR NG/G16 Beyer-Garratt locomotives, seen running on the Welsh Highland Railway in North Wales. The hobby is supported by a number of 16 mm live steam and electric traction builders, dominated by the likes of Roundhouse Engineering and Accucraft UK. Static model Historical There have been many short-lived and often promising model railway scales which are very much defunct nowadays. Quite often these were backed by only the company that created a new scale in the first place. See also National Model Railroad Association Normen Europäischer Modelleisenbahnen Rail transport modelling scales Rail transport modelling List of narrow gauge model railway scales References External links "About Gauge" guide from Lionel discussing O versus O27 gauge "More About Gauge" guide from Lionel discussing gauges other than O Lists of standards Modelling scale standards