CREATE TABLE table_6994 ("Locomotive" TEXT, "Serial No" TEXT, "Entered service" TEXT, "Owner" TEXT, "Operator" TEXT, "Livery" TEXT, "Gauge" TEXT, "Status" TEXT)

What is the Gauge of Locomotive G534 Owned by Aurizon which has a Status of Operational?
SELECT "Gauge" FROM table_6994 WHERE "Status" = 'operational' AND "Owner" = 'aurizon' AND "Locomotive" = 'g534'
SELECT "Gauge" FROM "table_6994" WHERE "Locomotive" = 'g534' AND "Owner" = 'aurizon' AND "Status" = 'operational'