Table: loco_details
Columns: sar_no
builder
year
works_no
firebox
driver_diameter

Question: What are the works numbers where the year is 1929 and the driver diameter is 60"/1520mm? 
SQL: SELECT "works_no" FROM loco_details WHERE "year" = 1929 AND "driver_diameter" = '60"/1520mm'

Question: For what year is the SAR no. 874?
SQL: SELECT "year" FROM loco_details WHERE "sar_no" = 874