What is the quantity preserved for the serial number of mallet and simple articulated locomotives?
CREATE TABLE table_66253 (
    "Class" text,
    "Wheel arrangement" text,
    "Fleet number(s)" text,
    "Manufacturer" text,
    "Serial numbers" text,
    "Year made" text,
    "Quantity made" text,
    "Quantity preserved" text
)
SELECT "Quantity preserved" FROM table_66253 WHERE "Serial numbers" = 'mallet and simple articulated locomotives'
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: What is the quantity preserved for the serial number of mallet and simple articulated locomotives? ### Input: CREATE TABLE table_66253 (
    "Class" text,
    "Wheel arrangement" text,
    "Fleet number(s)" text,
    "Manufacturer" text,
    "Serial numbers" text,
    "Year made" text,
    "Quantity made" text,
    "Quantity preserved" text
) ### Response: SELECT "Quantity preserved" FROM table_66253 WHERE "Serial numbers" = 'mallet and simple articulated locomotives'