How many metropolitan boroughs have dorridge as a station?
CREATE TABLE table_15366849_1 (c_ VARCHAR, metropolitan_borough_ VARCHAR, station VARCHAR)
SELECT COUNT(metropolitan_borough_)[c_] FROM table_15366849_1 WHERE station = "Dorridge"
### Context: CREATE TABLE table_15366849_1 (c_ VARCHAR, metropolitan_borough_ VARCHAR, station VARCHAR) ### Question: How many metropolitan boroughs have dorridge as a station? ### Answer: SELECT COUNT(metropolitan_borough_)[c_] FROM table_15366849_1 WHERE station = "Dorridge"