According to https://wiki.openstreetmap.org/wiki/Public_transport#Railways "*railway <https://wiki.openstreetmap.org/wiki/Key:railway>=subway_entrance <https://wiki.openstreetmap.org/wiki/Tag:railway%3Dsubway_entrance> can be used to define entrances to metro stations."*
Should we be using that tag to tag entrances to heavy rail underground stations, even though they aren't metros? I'm assuming the term subway here means a metro system, i.e. "A metro system is a rapid transit train system. In some cases, metro systems are referred to as subways or undergrounds." ( https://wiki.openstreetmap.org/wiki/Metros) Is there a tag for heavy rail above ground station entrances? These usually have branded signage visible on the streets of where to enter the train station. Again on https://wiki.openstreetmap.org/wiki/Public_transport#Railways"* Stations of subways are tagged with railway <https://wiki.openstreetmap.org/wiki/Key:railway>=station <https://wiki.openstreetmap.org/wiki/Tag:railway%3Dstation>, subway <https://wiki.openstreetmap.org/wiki/Key:subway>=yes <https://wiki.openstreetmap.org/w/index.php?title=Tag:subway%3Dyes&action=edit&redlink=1> and station <https://wiki.openstreetmap.org/wiki/Key:station>=subway <https://wiki.openstreetmap.org/wiki/Tag:station%3Dsubway>. The two latter tags are used to indicate that a station is a subway station."* Unfortunately the subway key is undocumented on the wiki, could someone please help explain what the subway key is meant to mean? How is it different to station=subway? How is it used by data consumers? Should it only be used on rapid transit train systems (metros), and not to be used on underground heavy rail stations? Many thanks!
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