3 ft gauge railways
{{short description|Railway track gauge (914 mm)}}
{{Sidebar track gauge}}
Image:Fintown Railway on trackbed of CDR County Donegal Railway (5950840669).jpg on the trackbed of the County Donegal Railways Joint Committee (CDR) in County Donegal]]
Image:Puente del Atoyac (Rio Balsas) - Ferro Carril Mexicano, 1883.jpg in 1883]]
Image:PeruRail 291.jpg on the Ferrocarril Santa Ana near Machu Picchu]]
Image:Tram 23 leading 4-car train in Port de Sóller, next to the bay.jpg on the Spanish island of Majorca]]
Three foot gauge railways have a track gauge of {{RailGauge|3ft}} or 1 yard. This gauge is a narrow gauge and is generally found throughout North, Central, and South America. In Ireland, many secondary and industrial lines were built to {{RailGauge|3ft|disp=1}} gauge, and it is the dominant gauge on the Isle of Man, where it is known as the Manx Standard Gauge. Modern {{RailGauge|3ft|disp=1}} gauge railways are most commonly found in isolated mountainous areas, on small islands, or in large-scale amusement parks and theme parks (see table below). This gauge is also popular in model railroading (particularly in G scale), and model prototypes of these railways have been made by several model train brands around the world, such as Accucraft Trains (US), Aristo-Craft Trains (US), Bachmann Industries (Hong Kong), Delton Locomotive Works (US), LGB (Germany),[https://web.archive.org/web/20140110174221/http://www.gbdb.info/data/expertenanleitung/LGB/Kat_02906.pdf 2006 LGB Catalog] and PIKO (Germany).