[Tagging] unfinished railway of historic importance

Greg Troxel gdt at ir.bbn.com
Sat Feb 25 13:24:10 GMT 2012

I favor railway=abandoned and then if necessary specialize from there.
The point about data consumers not knowing about new tags and therefore
building a semantic hierarchy to optimize for sensible behavior is a
strong one.

You probably already know this, but: in OSM railway=abandoned is what we
in the US would call "old railroad grade".  railway=disused seems to
cover both what we would call "out of service" (a term within railroad
regulation, referring to tracks/ROW still owned by the railroad, on
which they have discontinued service, but not formally abandoned -- and
might resume) and "abandoned" (again a term with formal meaning,
generally requiring ICC permission, etc.).

(Actually, the legal term abandonded is expanded by USGS topo maps into
two categories: abandoned (tracks present, more or less) and "old
railroad grade".)
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