Which Number of vehicles has a Type designation of u5-25 (bi-directional)?
CREATE TABLE table_37788 (
    "City" text,
    "Operator" text,
    "Type designation" text,
    "Number of vehicles" real,
    "Width" text
)
SELECT "Number of vehicles" FROM table_37788 WHERE "Type designation" = 'u5-25 (bi-directional)'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Which Number of vehicles has a Type designation of u5-25 (bi-directional)? ### Input: CREATE TABLE table_37788 (
    "City" text,
    "Operator" text,
    "Type designation" text,
    "Number of vehicles" real,
    "Width" text
) ### Response: SELECT "Number of vehicles" FROM table_37788 WHERE "Type designation" = 'u5-25 (bi-directional)'