user: Question: Who owns the locomotive that entered service on 30 October 1956?
Columns: ['Locomotive', 'Pre-conversion', 'Entered service (T)', 'Re-entered service (P)', 'Owner']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['P11', 'T336', '9 May 1956', '5 June 1984', 'V/Line Passenger']
SQL:

assistant: SELECT "Owner" FROM "Table" WHERE "Entered service (T)" = '30 October 1956';