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_name_28 ( serial_numbers VARCHAR, class VARCHAR )

### Question ###
What are the serial numbers for the locomotives of Class 4-8-4 oooooooo northern?

### Accurate SQL ###

SELECT serial_numbers FROM table_name_28 WHERE class = "4-8-4 — oooooooo — northern"