and { only { filter_less { all_rows ; year ( s ) of manufacture ; 1900 } } ; eq { hop { filter_less { all_rows ; year ( s ) of manufacture ; 1900 } ; railway number ( s ) } ; xi - xxii , xxviii } } = true
select the rows whose year  s  of manufacture record is less than 1900 . there is only one such row in the table . the railway number  s  record of this unqiue row is xi  xxii , xxviii .