user: Question: What is the year of daylight service when the builder was ALCO?
Columns: ['Builder', 'Model', 'Years of Daylight Service', 'Retired', 'Current Disposition']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['ALCO', 'PA', '1953–1968', '1968', 'No survivors']
SQL:

assistant: SELECT "Years of Daylight Service" FROM "Table" WHERE "Builder" = 'ALCO';