Question: What is the Gauge of Locomotive G534 Owned by Aurizon which has a Status of Operational?
SQL: SELECT "Gauge" FROM "2-15496934-1" WHERE "Status" = 'Operational' AND "Owner" = 'Aurizon' AND "Locomotive" = 'G534';

Question: Which Locomotive Entered Service in November 1984 and has an Operator of Southern Shorthaul Railroad?
SQL: SELECT "Locomotive" FROM "2-15496934-1" WHERE "Operator" = 'Southern Shorthaul Railroad' AND "Entered service" = 'November 1984';

Question: What is the Serial number of the Locomotive that Entered Service in November 1984 and has an Owner of Chicago Freight Car Leasing Australia?
SQL: SELECT "Serial No" FROM "2-15496934-1" WHERE "Entered service" = 'November 1984' AND "Owner" = 'Chicago Freight Car Leasing Australia';

Question: What is the Serial Number of the Locomotive that Entered Service October 1989?
SQL: SELECT "Serial No" FROM "2-15496934-1" WHERE "Entered service" = 'October 1989';