Table: southern_locomotives_5
Columns: class
wheel_arrangement
manufacturer
year_made
quantity_made
quantity_preserved
year_s_withdrawn

Question: What year was class of undine?
SQL: SELECT "year_made" FROM southern_locomotives_5 WHERE "class" = 'undine'

Question: What was the quantity preserved for quantity made of 15?
SQL: SELECT "quantity_preserved" FROM southern_locomotives_5 WHERE "quantity_made" = '15'

Question: Name the year for hercules
SQL: SELECT "year_made" FROM southern_locomotives_5 WHERE "class" = 'hercules'