user: Question: What is the class of the locomotive with a quantity made of 1 and a 0-6-0T type?
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 "Class" FROM "Table" WHERE "Quantity made" = '1' AND "Type" = '0-6-0T';