What is the build date of the model with a PRR Class of brs24?
CREATE TABLE table_name_61 (build_date VARCHAR, prr_class VARCHAR)
SELECT build_date FROM table_name_61 WHERE prr_class = "brs24"
### Context: CREATE TABLE table_name_61 (build_date VARCHAR, prr_class VARCHAR) ### Question: What is the build date of the model with a PRR Class of brs24? ### Answer: SELECT build_date FROM table_name_61 WHERE prr_class = "brs24"