CREATE TABLE table_56209 ("Class" CLOB, "Wheel arrangement" CLOB, "Manufacturer" CLOB, "Year made" CLOB, "Quantity made" CLOB, "Quantity preserved" CLOB, "Year ( s )  withdrawn" CLOB)

What year was class of undine?
SELECT "Year made" FROM table_56209 WHERE "Class" = 'undine'
SELECT "Year made" FROM "table_56209" WHERE "Class" = 'undine'