SELECT fleet_number_s_ FROM table_name_95 WHERE quantity_preserved = "0" AND quantity_made = "1" AND class = "z"
What is Fleet Number(s), when Quantity Preserved is '0', when Quantity Made is 1, and when Class is 'Z'?
CREATE TABLE table_name_95 (
    fleet_number_s_ VARCHAR,
    class VARCHAR,
    quantity_preserved VARCHAR,
    quantity_made VARCHAR
)