Table: rail_class_421
Columns: class
type
no_built_converted
year_built_converted
no_range
withdrawn

Question: Tell me the number range for 1965-66
SQL: SELECT "no_range" FROM rail_class_421 WHERE "year_built_converted" = '1965-66'

Question: Tell me the year built for withdrawn of 1983
SQL: SELECT "year_built_converted" FROM rail_class_421 WHERE "withdrawn" = 1983

Question: Tell me the year built for number built of 10
SQL: SELECT "year_built_converted" FROM rail_class_421 WHERE "no_built_converted" = '10'