text: https://wiki.openstreetmap.org/wiki/Tag:railway%3Dsubway_entrance
  
  Here it says name is the exit name
  The node normally marks an exit and an entrance simultaneously (despite its name) and the entrance rarely has a name. The name of the station can be inferred otherwise I think, through the relation.
  Tagging the exit name helps orientation when underground location is not available and its not clear from the exit names where it leads / its easier to just see it marked on the map.