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Public-images-osm logo.svg usage = test
ULTra PRT cardiff track aerial.jpg
Specifies that a railway is a test line: tracks used for testing of new vehicles or new rail transport technologies. Edit or translate this description.
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
Useful combination
See also
Status: in use

The tag usage=test is used together with railway=* to map a test line: railway tracks used for testing of new vehicles or new rail transport technologies. Most often used with railway=rail and railway=narrow_gauge.

service=* is added for sidings, crossovers, and yard tracks: Siding-tagging.svg

Other values of usage=*:

Tag Comment
usage=main Main line, presumably heavy traffic, often double tracked and/or electrified, may be high speed.
usage=branch Branch line, less traffic and lower speed than main lines, often single tracked and/or not electrified, may be constructed to lower specifications than main line. May connect a place to a mainline or serve to connect mainlines, typically a few dozen miles in length.
usage=industrial Tracks in private use that serve only freight transport inside ports, industrial complexes or mining areas, and for connecting these to the public network
usage=military Tracks for military use, mainly on military areas, munitions storage areas or connections to the public railroad network.
usage=tourism Tracks for tourists, around museums, historic or "heritage" trains, often only on weekends and holidays and/or seasonally, most preserved railways (railway=preserved and railway:preserved=yes)

See also