CREATE TABLE table_17200372_2 (going_to VARCHAR(255), calling_at VARCHAR(255), departure VARCHAR(255))
Name the number of going to for  thurlby, braceborough spa at departure being 16.50
    
SQL: SELECT COUNT(going_to) FROM table_17200372_2 WHERE calling_at = "Thurlby, Braceborough Spa" AND departure = "16.50"