If it is moveable it is a gantry crane. A gantry per se can be immobile, right?
That aside, rails are rails. Maybe not a rail line in the conventional sense, but I tagged an (unfortunately disused) children's train in Ashgabat https://www.openstreetmap.org/way/429019713 as a railway even though it goes around and around, or used to, and has no destination. light_rail unused name <https://wiki.openstreetmap.org/wiki/Key:name?uselang=en-US> Parawozik name:en <https://wiki.openstreetmap.org/wiki/Key:name:en?uselang=en-US> Children's Toy Train name:ru <https://wiki.openstreetmap.org/wiki/Key:name:ru?uselang=en-US> Детская железная дорога railway <https://wiki.openstreetmap.org/wiki/Key:railway?uselang=en-US> disused <https://wiki.openstreetmap.org/wiki/Tag:railway=disused?uselang=en-US> usage <https://wiki.openstreetmap.org/wiki/Key:usage?uselang=en-US> tourism On 11/23/2018 2:28 PM, Michael Patrick wrote: > > Some radio telescopes are located on what could be called rail > lines. ... > though these lines have to carry more localised weight and have a > much > larger track width. For a photo see > http://www.atnf.csiro.au/resources/imagebank/images/ATCA_in_a_line.jpg > > Ideas for suitable tags for these 'rail lines'? > > > 'Rails' certainly, but not 'rail lines' in the conventional sense., in > that a rail line implies an origin and destination ( in the 'railroad' > sense ), in this case all are parts of a single device, albeit a very > large one. > > A movable support structure primarily constrained in the horizontal > plane is known as a *gantry* (system). The constrained path might be > pavement, rails, sprockets and the movement contact point might be > wheels, slides, skates, airbags, tracks, pivot, or some such. The path > might be straight as for cranes or circular in the case of irrigation > systems, and other geometries that might include switches. They range > in size from tabletops > <http://go.aerotech.com/gantry?creative=313509089976> to almost a > kilometer > <https://www.researchgate.net/profile/Marco_Zimmerling/publication/316674860/figure/fig3/AS:490393876865026@1493930419717/The-open-pit-mine-where-the-wireless-network-was-installed.png> > in some mining and agriculture operations > <https://centrelineirrigation.com.au/image/data/centereline-irrigation-service.jpg>. > Their purpose and action differ from railway / rail line (etc.) - > i.e. primarily positioning > <https://en.wikipedia.org/wiki/Gantry#Devices_and_structures> vs. > transport. > > Michael Patrick > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging
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