Which Opened has a Category of diesel light rail?
CREATE TABLE table_14002 (
    "City" text,
    "System" text,
    "Category" text,
    "Daily ridership" real,
    "As of" text,
    "Opened" real,
    "Stations" text
)
SELECT MAX("Opened") FROM table_14002 WHERE "Category" = 'diesel light rail'
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 Opened has a Category of diesel light rail? ### Input: CREATE TABLE table_14002 (
    "City" text,
    "System" text,
    "Category" text,
    "Daily ridership" real,
    "As of" text,
    "Opened" real,
    "Stations" text
) ### Response: SELECT MAX("Opened") FROM table_14002 WHERE "Category" = 'diesel light rail'