CREATE TABLE table_50760 ("Class" TEXT, "Wheel arrangement" TEXT, "Fleet number ( s ) " TEXT, "Manufacturer" TEXT, "Year made" TEXT, "Quantity made" TEXT, "Quantity preserved" TEXT)

What class has 0 preserved and 2 made?
SELECT "Class" FROM table_50760 WHERE "Quantity preserved" = '0' AND "Quantity made" = '2'
SELECT "Class" FROM "table_50760" WHERE "Quantity made" = '2' AND "Quantity preserved" = '0'