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_8984 ( "Number" real, "Name" text, "Type" text, "Builder" text, "Works number" text, "Date built" real )

### Question ###
Who was the Builder for the locomotive that has a works number of 323?

### Accurate SQL ###

SELECT "Builder" FROM table_8984 WHERE "Works number" = '323'