Abstract: The present invention provides mobile agricultural machinery for use in the harvesting of root crops. The machinery (10) comprises a chassis (12) provided with wheels (14), root crop harvesting shares (18), and an elevator system (22) including at least one generally vertically extending portion for conveying tubers (40) or the like generally vertically upwards from a first level to a second level. The elevator system comprises first and second endless belts (24, 25) and drive means (30) therefor which drive said belts in counter-rotating directions so that opposed conveying surfaces of the belts are driven in a common direction so as to define a conveying passage (28) therebetween.