CREATE TABLE table_name_51 (built VARCHAR(255), to_iow VARCHAR(255), withdrawn VARCHAR(255), br_sr_no VARCHAR(255))
What is the number for year built of W27 that was withdrawn in 1967 with a To LoW year earlier than 1926?
    
SQL: SELECT COUNT(built) FROM table_name_51 WHERE withdrawn = 1967 AND br_sr_no = "w27" AND to_iow < 1926