Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_61 (builder’s_model VARCHAR, service VARCHAR, prr_class VARCHAR)
### Question:
What was the model for PRR class of gf28a freight?
### Answer:
SELECT builder’s_model FROM table_name_61 WHERE service = "freight" AND prr_class = "gf28a"