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Public-images-osm logo.svg gauge
Gauge EN.svg
Used to describe the 'gauge' (distance between the inside of the rails) on railways. Show/edit corresponding data item.
Group: railways
Used on these elements
should not be used on nodesmay be used on waysshould not be used on areasmay be used on relations
Useful combination
Status: de facto

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, e.g. gauge=1435 for "1435 mm".

As the Standard gauge of 1,435 millimetres (4 ft 8 12 in) 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, it is not incorrect to add gauge=1435 to a standard gauge railway.


The syntax in regular-expression form is \d+(;\d+)*. That is, only numbers, no units (always millimeters), and use semicolons to separate multiple gauges. Anything not in this form (as can be found in taginfo) should be changed.

Why not to use text values

Main article: Verifiability

Some users used gauge=broad, gauge=standard or gauge=narrow tags. These should be updated with precise information, as there are more than one type of broad/narrow gauges.

Dual gauge tracks

Tracks that support two or more gauges (by using three or more rails) should have all gauges specified using semicolon (";"), no space, as a separator. The smallest value should come first. Example: gauge=1000;1435.


Possible synonyms

If you know places with this tag, verify if it could be tagged with another tag.
Automated edits are strongly discouraged unless you really know what you are doing!