Abstract: A multiple drive chain system comprises two-chain pairs and a plurality of rotatable sprockets working together and with the chain pairs to lift and transport heavy loads. The two-chain pairs are arranged in superposed interlocking relationship and each chain is made of a succession of links having link plates wherein the link plates of the fourth chain lie between and are inner to the link plates of the third chain, and the link plates of the first plate lie between and are inner to the link plates of the second chain. The first and third chains are piggybacked for part of their travel and, similarly, the second and fourth chains are piggybacked through part of their travel.