Table: rail_stations
Columns: station
distance_from_wellington
height_above_sea_level_m
opened
closed

Question: Which station that sat 54m above seal level is now Closed?
SQL: SELECT "station" FROM rail_stations WHERE "height_above_sea_level_m" = '54m' AND "closed" = 'closed'

Question: Opened prior to 1877 only 2.44km from Wellington, when did this station close?
SQL: SELECT "closed" FROM rail_stations WHERE "opened" < 1877 AND "distance_from_wellington" = '2.44km'

Question: What is the height above sea level for the station opened 175.67km from Wellington prior to 1887?
SQL: SELECT "height_above_sea_level_m" FROM rail_stations WHERE "opened" < 1887 AND "distance_from_wellington" = '175.67km'

Question: For the station opened after 1876 at 604.53km from Wellington, what is the height above sea level?
SQL: SELECT "height_above_sea_level_m" FROM rail_stations WHERE "opened" > 1876 AND "distance_from_wellington" = '604.53km'