Table: g_class_locomotives
Columns: locomotive
serial_no
entered_service
owner
operator
livery
gauge
status

Question: What is the Gauge of Locomotive G534 Owned by Aurizon which has a Status of Operational?
SQL: SELECT "gauge" FROM g_class_locomotives 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 g_class_locomotives 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 g_class_locomotives 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 g_class_locomotives WHERE "entered_service" = 'october 1989'