user: ### NOW ANSWER:
Question: What is the locomotive with a Standard gauge and a serial number of 83-1015?
Columns: ['Locomotive', 'Serial No', 'Entered service', 'Gauge', 'Livery']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['BL26', '83-1010', 'March 1983', 'Standard', 'Pacific National blue & yellow']
SQL:

assistant: SELECT "Locomotive" FROM "Table" WHERE "Gauge" = 'Standard' AND "Serial No" = '83-1015';