user: Question: What year was the wheel arrangement 0-6-0 and a class 302?
Columns: ['Class', 'Wheel arrangement', 'Manufacturer', 'Year made', 'Quantity made', 'Quantity preserved', 'Year(s) withdrawn', 'Comments']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['William George Beattie (1871–1878)', 'William George Beattie (1871–1878)', 'William George Beattie (1871–1878)', 'William George Beattie (1871–1878)', 'William George Beattie (1871–1878)', 'William George Beattie (1871–1878)', 'William George Beattie (1871–1878)', 'William George Beattie (1871–1878)']
SQL:

assistant: SELECT "Year made" FROM "Table" WHERE "Wheel arrangement" = '0-6-0' AND "Class" = '302';