which locomotive did not have any info after it entered into service ?
CREATE TABLE table_203_27 (
    id number,
    "number" number,
    "serial no" number,
    "entered service" text,
    "withdrawn" text,
    "kilometres travelled" number
)
SELECT "number" FROM table_203_27 WHERE "kilometres travelled" IS NULL
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 locomotive did not have any info after it entered into service ? ### Input: CREATE TABLE table_203_27 (
    id number,
    "number" number,
    "serial no" number,
    "entered service" text,
    "withdrawn" text,
    "kilometres travelled" number
) ### Response: SELECT "number" FROM table_203_27 WHERE "kilometres travelled" IS NULL