What other OSM tags do train stations have

osm_station_tags

SELECT
  tag.k, count(*)
FROM
  public.node_tags tag
WHERE
  tag.node_id in
  (SELECT 
     node_id
   FROM
     public.node_tags t2
   WHERE
     t2.k = 'railway' and t2.v = 'station')
  AND tag.k != 'railway'
GROUP BY tag.k
ORDER BY count(*) DESC