How many trains depart at 17:30?
CREATE TABLE table_27011761_2 (train_no VARCHAR, departure VARCHAR)
SELECT COUNT(train_no) FROM table_27011761_2 WHERE departure = "17:30"
### 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"