CREATE TABLE table_name_33 (road_numbers VARCHAR(255), build_year VARCHAR(255), railroad__quantity_ VARCHAR(255))
what is the road numbers when the build year is 1943, the railroad (quantity) is clinchfield railroad (12 new, 6 secondhand)?
    
SQL: SELECT road_numbers FROM table_name_33 WHERE build_year = "1943" AND railroad__quantity_ = "clinchfield railroad (12 new, 6 secondhand)"