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[[Image:Gauge EN.jpg|thumb|right|Rail gauge]]'''Rail gauge''', sometimes track gauge, is the distance between the inner sides of the two parallel rails that make up a single railway line. Sixty percent of the world's railways use a '''standard gauge''' of 1,435 mm (4 ft 8+1⁄2 ' 8½" in). Wider gauges are called '''broad gauge'''; smaller gauges, '''narrow gauge'''. '''Break-of-gauge''' refers to a place where different gauges meet; sometimes this may involve '''transhipment''' and there may be extensive sheds to facilitate this. Some stretches of track are dual or mixed gauge, with three (or sometimes four) rails in place of the usual two, to allow trains of two or more different gauges to share the same path. Gauge conversion can be used to reduce break-of-gauge situations.