user: Question: What is the date of the locomotive with a Waterford class?
Columns: ['Class', 'Type', 'Names', 'Quantity made', 'Manufacturer', 'Date made']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Pioneer', '0-6-2T', 'Pioneer Sligo', '2', 'Avonside Engine Co.', '1877']
SQL:

assistant: SELECT "Date made" FROM "Table" WHERE "Class" = 'Waterford';