CREATE TABLE table_10555 ("Class" CLOB, "Wheel arrangement" CLOB, "Manufacturer" CLOB, "Year made" CLOB, "Quantity made" CLOB, "Quantity preserved" CLOB, "Year ( s )  withdrawn" CLOB, "Comments" CLOB)

How many have a class of 330?
SELECT "Quantity made" FROM table_10555 WHERE "Class" = '330'
SELECT "Quantity made" FROM "table_10555" WHERE "Class" = '330'