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Public-images-osm logo.svg railway = narrow_gauge
Narrow gauge.jpg
Passenger or freight trains on narrower tracks than the typical gauge for the country or state. Edit this description in the wiki page. Edit this description in the data item.
Rendering in OSM Carto
Rendering-railway light rail funicular narrow gauge-125.png
Group: railways
Used on these elements
should not be used on nodesmay be used on waysshould not be used on areasshould not be used on relations (except multipolygon relations)
Useful combination
Status: de facto

railway=narrow_gauge is used for passenger or freight trains on narrower tracks than the typical 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.

You are highly encouraged to use gauge=* to specify the actual track width of rails. If you don't know the exact gauge, just use gauge=narrow.

Narrow gauge railways can have mainline railway service like the Rhaetian Railway in Switzerland or can be a small light industrial railway.

For small railways in parks which are tourist attractions and not part of a railway network railway=miniature is used instead.
For tracks of a roller coaster roller_coaster=track is used instead.