CREATE TABLE table_name_54 (original_operator VARCHAR, builder VARCHAR, ship VARCHAR)

Who is the original operator for the AG Vulcan builder and the Prinzess Irene ship?
SELECT original_operator FROM table_name_54 WHERE builder = "ag vulcan" AND ship = "prinzess irene"
SELECT "original_operator" FROM "table_name_54" WHERE "ag vulcan" = "builder" AND "prinzess irene" = "ship"