CREATE TABLE table_name_76 (number_of_vehicles VARCHAR, type_designation VARCHAR)

Which Number of vehicles has a Type designation of u5-25 (bi-directional)?
SELECT number_of_vehicles FROM table_name_76 WHERE type_designation = "u5-25 (bi-directional)"
SELECT "number_of_vehicles" FROM "table_name_76" WHERE "type_designation" = "u5-25 (bi-directional)"