CREATE TABLE table_6593 ("Locomotive" CLOB, "Delivered as" CLOB, "Entered service" CLOB, "Owner" CLOB, "Status" CLOB)

What is the Entered service date of the T413?
SELECT "Entered service" FROM table_6593 WHERE "Delivered as" = 't413'
SELECT "Entered service" FROM "table_6593" WHERE "Delivered as" = 't413'