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_56 (build_date VARCHAR, prr_class VARCHAR)

### Question ###
What is the build date of the model with PRR Class brs24?

### Accurate SQL ###

SELECT build_date FROM table_name_56 WHERE prr_class = "brs24"