Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_34839 ( "Locomotive" text, "Pre-conversion" text, "Entered service (T)" text, "Re-entered service (P)" text, "Owner" text )

### Question ###
Who owns the locomotive that entered service on 30 October 1956?

### Accurate SQL ###

SELECT "Owner" FROM table_34839 WHERE "Entered service (T)" = '30 october 1956'