CREATE TABLE "locomotives" (
  "locomotive" text,
  "pre_conversion" text,
  "entered_service_t" text,
  "re_entered_service_p" text,
  "owner" text
);

Question: Who owns the item that was a T326 before conversion and re-entered service on 11 September 1985?
SQL: SELECT "owner" FROM "locomotives" WHERE "re_entered_service_p"='11 september 1985' AND "pre_conversion"='t326';

Question: What date did the T328 that entered service on 18 June 1956 re-enter service?
SQL: SELECT "re_entered_service_p" FROM "locomotives" WHERE "entered_service_t"='18 june 1956' AND "pre_conversion"='t328';

Question: Which of V/Line Passenger's pre-conversions re-entered service on 23 November 1984?
SQL: SELECT "pre_conversion" FROM "locomotives" WHERE "owner"='v/line passenger' AND "re_entered_service_p"='23 november 1984';

Question: Who owns the locomotive that entered service on 30 October 1956?
SQL: SELECT "owner" FROM "locomotives" WHERE "entered_service_t"='30 october 1956';