Key:gauge

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+/- gauge Description Used to describe the 'gauge' (distance between the inside of the rails) on railways. Group Railway Element help Useful combination railway=* electrified=* operator=* Tools for this tag Combinations worldwide in Australia/Oceania in Europe (list) in Asia (list) in Central America (list) in South America (list) in Africa (list)  (via overpass turbo - help)

This tag can be used to specify the track width (gauge) of railways.

It is specified in millimetres (mm, 1/1,000 of a metre) as is the railway and tagging practice. Other units can be used by adding the unit after the value (e.g., gauge=2yd), but should be avoided if possible.

As the Standard gauge of 1435 mm is used on most of the world's railways, it is particulary important to add the track width for narrow gauge and broad gauge railways, and it is suggested that mappers concentrate on adding this tag to these railways. However, this does not mean adding gauge=1435 to standard gauge railways is disallowed.

If you do not know the exact measurement, you may use gauge=broad, gauge=standard or gauge=narrow.

Dual gauge tracks

Tracks that support two or more gauges (by using three or more rails) should have all gauges specified using semicolon (";") as a separator. Example: gauge=1000;1435.

Rendering

ITO has a map that renders gauge tags.