CREATE TABLE table_77477 ("Country" TEXT, "Builder" TEXT, "Location" TEXT, "Ship" TEXT, "Class / type" TEXT)

What is the Cargo Ship located at Birkenhead?
SELECT "Ship" FROM table_77477 WHERE "Class / type" = 'cargo ship' AND "Location" = 'birkenhead'
SELECT "Ship" FROM "table_77477" WHERE "Class / type" = 'cargo ship' AND "Location" = 'birkenhead'