|railway = narrow_gauge|
|Passenger or freight trains on narrower tracks than the standard gauge for the country or state.|
|Rendering in OSM Carto|
|Used on these elements|
|Status: de facto|
|Tools for this tag|
Use railway=narrow_gauge for passenger or freight trains on narrower tracks than the standard gauge considered for the country or a railway network, often tourist routes or mine railways. This implies that it is a less common value than railway=rail.
Narrow gauge railways can have mainline railway service like the Rhaetian Railway in Switzerland or can be a small light industrial railway.