> ... There is a short section of the Trans-Alaska pipeline that crosses a well-known fault line where it is attached to slides to allow lateral movement in case of an earthquake. I split the pipeline way and added a note to the section but that probably isn't visible to most data consumers. Any ideas?
OMG, Thank You Dave! I love ontological edge cases - and this is certainly good one. :-) I'd add something like "Deliberate Operator Movement" or "Directed Movement" or some such to my description. These sort of joints are quite common once one is cued to notice them. A friend of mine pointed on that a clear distinction was the pure unidirectional ( along one path ) of rail-lines, whether it's road trains, maglevs, or rail roads. There's no up/down or side ways component except through a split, curve, or join in the track, where in the case of a movable gantry there is usually a lifting, rotating, or conveying occurring in addition to along the track axis. And as an additional note, regardless of the type of point of contact ( rail, tire, magnetic ) the term for what directs the travel is a 'track' ( unfortunately already occupied by the road term ). > If it is moveable it is a gantry crane. A gantry per se can be immobile, right? The immobile case ( like the fixed support for signs ) isn't that common, as far as I could tell - in the sign case, the immobile case was more commonly more simply called a 'bridge', probably because the spanning part on even movable gantries and cranes is called a bridge. > 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. Another excellent case. Although it might be said t the origin and destination merely have the same location, and differ along time and direction path, , and as I noted, it's primary feature is as a conveyance, not 'positioning' something for an action. Here the 'rails are rails' in two uses ( http://www.davidheyscollection.com/userimages/0001-dh-thornaby-roundhouse.jpg ), but only one is the 'conventional sense' of a rail line - the other rail is for positioning. Michael Patrick
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