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Rail gauge

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Track gauge or rail gauge is the distance between the inner sides of the heads of the two load bearing 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 8½ in). Wider gauges are called broad gauge; smaller gauges, narrow gauge. Break-of-gauge refers to the meeting of different gauges. Some stretches of track are dual gauge, with three or four rails, allowing trains of different gauges to share them. Gauge conversion can resolve break-of-gauge problems. An exception of a railway with no gauge is monorail where there is only one supporting rail. Some electrified railways use non load bearing third rail and occasionally a fourth rail. These additional rails are positioned between or outside the “running rails” to feed and re Rail gauge is the distance between the inner sides of the two parallel rails that make up a railway track. Fifty-five percent of the world's railways use a gauge of 4 ft 8½ in (1,435 mm), which is known as the standard or international gauge. Gauges wider than standard gauge are called broad gauge, those smaller are called narrow gauge. Some stretches of track are dual gauge, with three (or sometimes four) parallel rails in place of the usual two, to allow trains of two different gauges to share the same path. The term break-of-gauge refers to the situation at a place where different gauges meet.

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Track gauge or rail gauge is the distance between the inner sides of the heads of the two load bearing 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 8½ in). Wider gauges are called broad gauge; smaller gauges, narrow gauge. Break-of-gauge refers to the meeting of different gauges. Some stretches of track are dual gauge, with three or four rails, allowing trains of different gauges to share them. Gauge conversion can resolve break-of-gauge problems. An exception of a railway with no gauge is monorail where there is only one supporting rail. Some electrified railways use non load bearing third rail and occasionally a fourth rail. These additional rails are positioned between or outside the “running rails” to feed and return electrical current; they do not define the rail gauge. Gauge tolerances specify how much the actual gauge may vary from the nominal gauge. For example, the U.S. Federal Railroad Administration specifies that the actual gauge of track that is rated for a maximum of mph () must be between 4 ft 8 in (1,422 mm) and 4 ft 9½ in (1,460 mm). A track gauge is also the measuring device used to test whether rails are within the correct gauge. Rail gauge is the distance between the inner sides of the two parallel rails that make up a railway track. Fifty-five percent of the world's railways use a gauge of 4 ft 8½ in (1,435 mm), which is known as the standard or international gauge. Gauges wider than standard gauge are called broad gauge, those smaller are called narrow gauge. Some stretches of track are dual gauge, with three (or sometimes four) parallel rails in place of the usual two, to allow trains of two different gauges to share the same path. The term break-of-gauge refers to the situation at a place where different gauges meet.