user: Question: What is the entered service date for serial number 85-1222?
Columns: ['Locomotive', 'Name', 'Serial No', 'Entered service', 'Owner']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['N451', 'City of Portland', '85-1219', '20 September 1985', 'V/Line Passenger']
SQL:

assistant: SELECT "Entered service" FROM "Table" WHERE "Serial No" = '85-1222';