tokens: These nineteen locomotives were 705 , 707 , 709 , 710 , 714 , 716 , 717 and 718 ( 20th ) and 723 , 724 , 726 , 727 , 729 , 738 , 746 , 747 , 749 , 753 and 756 ( 20A ) were mainly used in the transportation of coal between Thomson Junction to Bulawayo and Victoria Falls .