user: Question: Can you tell me the Class (old) to 1868 that has the Quantity larger than 8?
Columns: ['Class (old) to 1868', 'Railway number(s)', 'Quantity', 'Year(s) of manufacture', 'Type']
Types: ['text', 'text', 'real', 'text', 'text']
Sample row: ['I a ( de )', '1–6', 6.0, '1839–1843', '1A1 n2']
SQL:

assistant: SELECT "Class (old) to 1868" FROM "Table" WHERE "Quantity" > 8.0;