CREATE TABLE table_68864 ("Type" TEXT, "Fleet numbers" TEXT, "Quantity made" FLOAT, "Date made" TEXT, "GSR Class" TEXT, "GSR Nos." TEXT, "Withdrawn" TEXT)

How many locomotives were made that were withdrawn in 1913?
SELECT "Quantity made" FROM table_68864 WHERE "Withdrawn" = '1913'
SELECT "Quantity made" FROM "table_68864" WHERE "Withdrawn" = '1913'