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_4 ( prr_class VARCHAR, build_date VARCHAR, wheel_arrangement VARCHAR, service VARCHAR )

### Question ###
What is the PRR class of the freight train built in 1967 with a b-b wheel arrangement?

### Accurate SQL ###

SELECT prr_class FROM table_name_4 WHERE wheel_arrangement = "b-b" AND service = "freight" AND build_date = "1967"