|Used to describe the 'gauge' (distance between the inside of the rails) on railways.|
|Used on these elements|
|Status: de facto|
|Tools for this tag|
As the Standard gauge of 1,435 millimetres (4 ft 8 1⁄2 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
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.