text: 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_27011761_2 (train_no VARCHAR, departure VARCHAR)
  ### Question:
  How many trains depart at 17:30?
  ### Answer:
  SELECT COUNT(train_no) FROM table_27011761_2 WHERE departure = "17:30"