user: Question: What are the works numbers where the year is 1929 and the driver diameter is 60"/1520mm? 
Columns: ['SAR No.', 'Builder', 'Year', 'Works No.', 'Firebox', 'Driver Diameter']
Types: ['real', 'text', 'real', 'real', 'text', 'text']
Sample row: [843.0, 'Baldwin', 1929.0, 60820.0, 'Narrow', '63"/1600mm']
SQL:

assistant: SELECT "Works No." FROM "Table" WHERE "Year" = 1929.0 AND "Driver Diameter" = '60"/1520mm';