user: Question: In what year was the CTC-3 model built?
Columns: ['Year built', 'Builder', 'Model', 'Fleet ID', 'Seats']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['1978–79', 'Pullman', 'BTC-1C', '200–258', 114.0]
SQL:

assistant: SELECT "Year built" FROM "Table" WHERE "Model" = 'CTC-3';