CREATE TABLE table_name_15 (station VARCHAR2, height_above_sea_level__m_ VARCHAR2)

Which station that sat 54m above seal level is now Closed?
SELECT station FROM table_name_15 WHERE height_above_sea_level__m_ = "54m" AND "closed" = "closed"
SELECT "station" FROM "table_name_15" WHERE "54m" = "height_above_sea_level__m_" AND "closed" = "closed"