CREATE TABLE table_15366849_1 (c_ VARCHAR, metropolitan_borough_ VARCHAR, station VARCHAR)

How many metropolitan boroughs have dorridge as a station?
SELECT COUNT(metropolitan_borough_) AS "c_" FROM table_15366849_1 WHERE station = "Dorridge"
SELECT COUNT("metropolitan_borough_") AS "c_" FROM "table_15366849_1" WHERE "Dorridge" = "station"